Question about production options/combinations, etc.

[1972K20]

Hello all,

First post here! I really enjoy this site. I have lurked this forum for a while now and have really enjoyed reading the information here.

I do have a few questions about the 67-72 trucks. So, here it goes.

Where is the best place to find information about production numbers, engine/transmission/axle ratio combinations and option packages?

For example, one thing I've wondered is, how common is it for a Cheyenne 4x4 to come with a 4spd instead of the Turbo Hydramatic? Was the Cheyenne or Cheyenne Super available in 30 series trucks?

I just read a post the other day that said GM didn't put big blocks in 4x4s until 1981. I never knew that before.

What are some of the rarer options or combinations that where available? It seems like the AM/FM radio option was rare.

Thanks in advance!