If your 326 is a 65-67, yes.
no
no
Yes, I just changed a 1985 305CI intake to a new GM 350CI long block crate motor.
An intake from a Pontiac 400 will fit a 389 as long as the engine, or more specifically, the heads are from model year 1965 or 1966.
Everything should bolt right up.
No. Bell housing is totally different. The guts of the trans are the same.
yes it should bolt right up.
Will Pontiac Montana rims fit WHAT? Your question is not complete. What do you want to fit the Montana rims on?
IF YOU HAD THE BLOCK OR HEADS MILLED THIS WILL CAUSE YOUR INTAKE NOT TO FIT. YOU NEED TO TAKE THE INTAKE TO THE MACHINE SHOP AND HAVE IT MILLED ALSO.
will a radiator from pontiac fit a chevy s 10
Yes, they will fit.
I added a link for you to check out. According to this site it will fit. I do know that the thermostat housing is different and that you will have to run a point type distributor as the HEI won't clear the carb. A Mallory Uni-lite might clear. Not sure.