Putting a 400 into a 1980 Firebird

I have a 1980 firebird now with a 301 and a T350 tranny, Im wanting to put a mid 70's 400 with a T400 tranny into it. Will all of the engine mounts and tranny mounts line up? and is there anything else that I will need to do? any help is much appreciated

the engine will mount just fine the tranny should as well i did the same thing in a 80 ta i had it was a long process but worked great and btw u might want to update the exhaust if u have not done so

yah im planning on building the engine into a half day to day and half drag car

alright so I shouldnt encounter any problems doing this?

u shouldn' have any problems its not even a tight squeeze u r going to need some new bypass belts well i did i took out my ac since it didn't work and i put on a new fan u might need a bigger radiator i found one at a junk yard and they gave it tp me 3 core might work i had a 2 so i put a 4 in it if u have a 2 u need a bigger one other than thateverything worked.

what would i need bypass belts for?

more horses.

how so?????

would it work with my current T-350 as well?

your 350 t should bolt up to as well.. the less belts running = less strain on your motor= more hp.

well it dosent have ac so the only other thing to bypass is the smog pump which ill take apart and then just leave the pully to spin freely

i would just bypass that pully all together there pretty cheep for a bypass belt i think they were like 4 dollars a piece less pullys running he better pluss smaller belts are better as well. let me know how this process works out

i will

but the pump still needs to spin cause if air care inspects the engine compartment i will fail it on the spot

and i just hate aircare cause if u dont got the cats and that stuff it dosent matter what comes out the tail pipes you still fail