tire and wheel question again...from the new guy

[sierragrande77]

Hey guys this is my first post. I have read a lot of the threads about drops of different heights and wheel and tire combos. I am restoring my 77 sierra grande. My Dad bought it new in 77. It was my high school truck. I hope for my son to drive it when he is 16. (He's almost 1 now!)...

Any way I think I am going to go with a 2.5-4 drop to start. I would like it a little lower, but my Dad doesn't want too low. I am looking to just be at or just above the height of the tire. I may cut the front coils and remove a leaf if it is too high. I am going with 20x10 in the rear and 20x8.5 in the front. What back space and tire size would you recommend? I am wanting to stay the same diameter that I have now. (235/75/15) About 27.5-28 inches tall.

I will post some build pics soon. Here is what I have planned:

1. 2-tone orange metallic with pearl white. I am going to paint the top of the cab pearl white also. Same old look with updated paint colors.
2. 4 wheel disc brakes
3. Full trim package.
4. New stock interior.

More details later. Thanks!