What can you tell me about this spark plug?
 

Hey guys here to pick your brains a little, I installed a new Holley 2bbl 500 cfm carb,and it runs fine according to me,but the tail pipe of my exhaust have turned black inside,like if a rick condition exist, but my plugs read lean, plus I get this gas smell wen the truck is at idle,what do you guys read wen you look at this plugs?Here are some pictures. Thanks in advance for your input.

https://www.ford-trucks.com/forums/p...ctureid=125145

https://www.ford-trucks.com/forums/p...ctureid=125144

https://www.ford-trucks.com/forums/p...ctureid=125143

https://www.ford-trucks.com/forums/p...ctureid=125142

https://www.ford-trucks.com/forums/p...ctureid=125141

Very lean at lower rpms, might be on the rich side at the higher end though. Get it up to temperature, then do a hard run and shut it down quick, without idling. Pull a couple plugs to see then, but use caution restarting since it'll probably backfire.

Today's fuels give a different plug reading compared to non ethanol gas.