Re: brake booster
30 years ago I removed a power brake booster and related parts from a '65 GMC 3/4 ton 4WD truck and installed everything on my '65 Chevy 1/2 ton 4WD.
In addition to the booster, there is a bracket that mounts it to the firewall in this application. The booster is spaced about 2 inches off the firewall. I don't remember now if I also swapped pushrods or not. Some GM power brake set ups also use a bracket mounted to the non power brake pushrod hole on the pedal to activate the brake light switch as the lower pedal height would have the brake lights on all the time.
If needed, I can look as I have the '65 truck still and a '66 truck just like it without power brakes. Later, I added a dual reservoir master cylinder and combination valve for the extra safety. That allowed me to use a left front brake hose from a '67 to '69 4WD Chevy/GMC. The original 60-66 4WD left front brake hose was the 3 way "T" for the brake system and was no longer available anywhere.
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