Questsion about wheels

[Chapstr's65]

Ok I am sure this is on here somewhere but I can not seem to find it. I am wondering if a 20x9.5 wheel with a 6" back spacing and 255/35/20 (27.05" diam 10.24" width) will fit the front of a 65 stepper and rear will have 265/35/20 (27.32" diam 10.67" width)that has a 5 1/2" front and 5" rear static drop. Can any of you experts help??

I am also goint to do the dropwith 2 1/2" cpp drop spindles or the modular drop spindles if i have to.

Thanks in advance

oh and for those guys who are going to tell me to go measure my truck I can not becasue it is in another state and the sale on the wheels which ill save me almost two hundred dollars ends tomorrow .