will a 454 big block and a 400 turbo transmission fit a 1957 four door bel air the original engine is a 283 small block
Only if there's room for them. Seriously, that's too much power & torque for that car without some HD mods to the chassis/frame. A 350 is a better choice, in my humble opinion. Have some aspirin on hand, and good luck.
why its a classic
yes it will fit just watch for distributer clearence, get motor mounts, transmission crossmember, and it should slide right in. good luck
It will fit within the frame, but you'll have to do some work on the firewall, it may not clear the distributor or the tranny.