Late to the party here. 2X on the firing order on the wires wrong or timing chain jumped. Double check that you have the correct wires going to the correct cylinders in order. 360/390 is:

If the wires are in the correct order then put that breaker bar back on the crank bolt. Move the crank back and forth noting how long it takes to get the Dizzy rotor to move. Excessive crank rotation before the rotor moves indicates the chain and gears loose as a goose. And prolly your problem.

 

truck is starting first turn of the key after I replaced the alternator, starter solenoid, and cleaned up a couple grounds... I have not tried driving it yet but the idol is randomly holding at 2000 rpm and then goes to 500-600 then back again at random lengths of time I'm thinking possibly something with the choke it's the factory 2 barrel motorcraft 2100 I believe is the number I'm not quite sure what to look for here

 

just went out to start up the truck it crank at normal speed fired up for a sec then died without idol-ing at all now when I crank it nothing spins but I can here a very loud buzzing maybe the starter motor?

 

That's progress!! These beasts can be a little ornery after a long slumber. Take it easy on the starter (and battery.. and solenoid) for a while till things get sorted out. Normally, an FTE maintained engine lights off with just a flick of a key, natch. This is how they are designed. So a mistuned engine, that won't start or start very easily, will really put the starter and other components through the wringer. Keep the battery on a charger overnight, let the starter cool down several minutes between start attempts.

The 2100 is an easy carburetor to work on. If it hasn't been opened up in say the last five years, it would be a good idea to put a kit in it. Clean it out, use new gaskets and set it up and it will purr. edit: I see you've rebuilt carb. Check that fuel height in the bowl is correct, and idle mixture screws are adjusted and tuned.

The buzzing sounds might be the Bendix. Is starter just spinning free or is it locked? Maybe check flywheel teeth for damage too.

 

The idle up and down is the carb. Sounds like it needs a soaking and a rebuild.
I believe the buzzing g is the solenoid, result of a low battery.

 

the buzzing has me confused because it goes from full speed cranking to a dead stop and buzzing instantly it's either one or the other no slow crank just all or nothing and the carb was just rebuilt by me last week maybe the carb is just bad

 

what is the bendix sorry for the question lol and I will check the flywheel after work today thank you sir!

 

You know when it idles down and the carb sounds like it could suck start a Harley and then goes away when it idles up? Something is not happy in the carb.

Is the buzzing noise coming from the fender or lower as in at the starter?

 

that sucking noise you are talking about from the carb sounds like what happens when I hit the gas sometimes if i slowly roll onto it it revs normally but anything more ham slow as possible it has a spot in the middle of the pedal where it sounds like it's going to die then catches back up and revs... I can't quite tell wether the buzzing noise is coming from lower or high I need to get a friend to check when I try to start it but it is from the far passenger side

 

Loose battery cables/or dirty grounds cables.
Orich

 

thank you I will check on that!

 

I double checked every cable was tight and cleaned up every ground I could find. Charging the battery right now and I will update once I get that in