will these wheels work??

[draggin49]

Someone offered me a set of wheels (set of 4) 20x8 with 4.5" backspacing.
My all stock 1969 c10 is being fitted next week with an ece 4.5/6 drop and their 5 lug front disc conversion along with 5 lug rear axles to be fitted into the stock 1969 rear end.

My truck has no front inner fenders,(were removed when I originally was going to do air ride)

Will this backspacing work? I believe the the rear will be a tad narrower? Would these wheels with spacers in back work??

Just dont want to buy them if they are gonna be wrong, but if they will work the price is right and cant pass them up.

Im guessing 245/40/20 or 255/40/20 might be a good size all the way around??

Thanks guys!!!
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