it is a pontiac 350 out of 76 firebird. i have 79 grandprix with 301 in it.if the 350 engine and trans will bolt up to mounts and tranny mounts i would rather rebuild the 350 and put in as long as i dont need to do a bunch of modifications to switch. i think bell housings are different from 350 to 301 but i got trans out of firebird also