yes but there will be lots of mods such as stearing rack, headers, and hood. but it can be done. :)
Yes it will, I own a 1990 GMC Suburban 2500 (3/4 ton) and it came from the factory with a 454 motor.
Yes.
yes it will need no mods to fit either
350, 400, 454
yes
350, 400, 454
Yes, you have to change the Motor Mounts and get the correct headers but it will fit.
You should be able to. The 454 came stock in the '74 which is the same body style.
it will fit. you will have to use camaro frame mounts.
set er on and find out lol
Is there enough room, yes.
I'm not sure how much bigger than a 454 you can put in it, but a 350 will definitely fit in it, as I'm sure you already know, along with the 454.