Newby- My first Questions

[Lees68GMC]

I'm disc braking (1.25 rotors) and using McGaughey 2 1/2" drop spindles, 5 lug on my 68 GMC SWB. Tires on it at stock height were 275-60-15 BFGs on 8" wide alloy wheels.

Does anybody Know or have personal experience here, Can I run 15 X 10 Corvette style 5 lug Rally Wheels (5" back space) with the Same 275-60-15 BFGS on All for corners without serious clearance issues?

Rephrased;

With the same size tires that clear NOW on all four with 8" wide rims at Stock ride height, can I switch to running NEW 10" wide steel rims and the same exact tires at a 2-1/2 front spindle drop and a 2" rear shackle drop?

Thanks Guys