I have a 76 Monte Carlo with a 350 engine, but i want to put in a 454 engine, my question is will it fit?
That style was from '73 to '77. The '75 was the last year the 454 was offered but it will still fit in yours. The BB engine mount brackets will bolt to the SB mounts on your frame. Exhaust will need to be re-worked. You'll want to upsize the rad to a good 3 or a 4 core. Is it a manual or Auto.
Yes just buy & use the big block Chevy motor mounts.