Need help! Boss 338 fitment.

[RaceAGMC]

I know wheel fitment has been covered many times, but I have read threads and have gone dizzy trying to decipher everyone's setups and wheel fitments. So if someone could give me some help it would be awesome. I plan on running a 20x8.5 and 20x10.

My setup:

1970 SWB Fleetside
CPP disc brake conversion with NON modular 2-1/2" spindles
2" front spring
Stock 71 rear 5 lug axle
5" drop rear spring

I already have tires, I chose a common size that a lot of guys are running.
255/40/20 and 295/40/20

I plan on keeping my front fender wells. If I have to I can get the modular spindles, but would rather have a wheel that sets back in the wheel well with the spindle I already have but if its not an option with these wheels I can go to the modular ones.
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