Question about front & rear ends

[1959 Apache 3600]

I've got a '59 3/4 ton stepside. The darn truck is as old as me, which is why I bought it, and is why I'm embarrassed to ask a question like this....

I see folks cutting in camaro, chevelle and other IFS front ends, but how do you know what will fit and work? I hit swap meets whenever I can and see this stuff, but don't know what will work. Same with the rear end suspension.

I'd like to lower my 3600 but don't see much of anything in the catalogs that will help me accomplish that. It's all geared towards 1/2 ton stuff.

Anybody shed any light on this to an oldnewbie?

Thanks guys.. and gals