The aftermarket springs will need to be installed at a certain height to work properly, this may require adding shims or cutting the spring seats.
Although it shouldn't be a issue with that lift the valve guide height needs to be checked also to make sure the valve spring retainer doesn't hit the guide or crush valve stem seal.
Stock rockers will work fine with those cams, Most stock rockers and stands will set lifter preload at around .040-.060, for performance hyd cams I try to set preload at .020-.030, with the FE's rocker ratio it shouldn't take more than .005-.015 of shims to get you what you need.
If the heads have been milled it may take a little more shim.


Side Note: I see your on another forum I visit as well. How's the 4BT Cummins doing in your truck.
I've got 500 miles on the newly rebuilt 5.9 12v in my F-450, been hauling round bales with it, got another 170 rolls to haul in in the next few days.

 

Actually, I have seen that proven to work. Dad set a 390 up to run on propane. He used a 390 crank and 360 rods and pistons. The pistons were something like .015 out of the hole. Valve clearance would have to be checked, but it wasn't a problem when dad did his.

Yes the 360 rods are weaker, but I'm not going to be putting a whole lot of strain on them. (4,000 RPM in high gear will be around 30 MPH )

The big ***** thumpr cam needs 9.5:1 which I will have with 390 rods - but would 10.7:1 make it run any better?

 

Runs like a scalded dog. Getting about 19 - 20 mpg (good for me, my first gen gets 15 -16 - might have something to do with my right foot) and loving every minute of it.

 

With 9.5:1 you can run pump gas
10.7:1 will need some race fuel mixed in.


My old engine wasn't anything to brag about but had a running average of 14 mph loaded and empty combined, towing a trailer 50% of the time, loaded 50% of trailer miles.
Filled up today showing 11 mpg on 370 miles, all towing, loaded 70% of mileage with 12-14k lbs on the trailer, the first 150 miles where empty truck but didn't have a full tank to start with so mileage couldn't be figured.
This new engine has a lot more power and I'm having some issues getting AFC Live tuned in, still getting a little smoke (more than a haze) when accelerating.
Just finished backing the smoke screw out half a turn and cranked the star wheel out a couple turns to add more tension to the afc spring, we'll see how it runs on the next load.

 

I could set it up to run E85, would that cut it for 10.7:1? Or is there no advantage to the higher compression for what I am wanting? Which would be better for the low end (yes, I know it will always suck )?