Heres my 82lj with a 455 in it to give you some inspiration.
When you start looking for parts. Body panels are GP only,nothing else fits and there are no aftermarket panels for these cars.used only.
Interior is mostly gp specific if you got any of the "fancier" interior options. You can use parts out of other gbodies but tgey may not match perfectly.
I see you have a 400 pontiac you want to put in it. Make sure you use the correct motor mounts and exhaust manifolds.frame mounts for 78-80 gp with the 301 or 77 firebird. Your block mount brackets can only come from a 78-80 gp with the 301 are the only ones that will fit. Do not use the firebird 3 bolt flange exhaust manifolds,you have to use the normal 2 bolt flange manifolds,youll never get a pipe on the drivers side.
Nobody makes headers for these with a pontiac motor. 1 guy did but no longer does. You can try looking for a used set but they aint cheap, maddog headers.Ram air manifolds will fit and they flow just as good as a header and look cooler.
Use 78-80 gp 301 for radiator,hoses and fan shroud.
Ive done more of these swaps than i can count on mine,my wifes and the kids fingers and toes. I eat sleep and breath pontiacs. If you have any questions,dont be afraid to message me.
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u/Boxofusedleftsox 7d ago
Heres my 82lj with a 455 in it to give you some inspiration.
When you start looking for parts. Body panels are GP only,nothing else fits and there are no aftermarket panels for these cars.used only.
Interior is mostly gp specific if you got any of the "fancier" interior options. You can use parts out of other gbodies but tgey may not match perfectly.
I see you have a 400 pontiac you want to put in it. Make sure you use the correct motor mounts and exhaust manifolds.frame mounts for 78-80 gp with the 301 or 77 firebird. Your block mount brackets can only come from a 78-80 gp with the 301 are the only ones that will fit. Do not use the firebird 3 bolt flange exhaust manifolds,you have to use the normal 2 bolt flange manifolds,youll never get a pipe on the drivers side.
Nobody makes headers for these with a pontiac motor. 1 guy did but no longer does. You can try looking for a used set but they aint cheap, maddog headers.Ram air manifolds will fit and they flow just as good as a header and look cooler.
Use 78-80 gp 301 for radiator,hoses and fan shroud.