No. they are different head designs.
yes
One at a time
Same block, should fir right in
600lbs
Try PostonBuick.com or TAperformance.com..
The firing order for a 1970-76 455 should be 18436572 Enjoy!
yes might have to change motor mounts
It had a 455.
Really big.
455
Under the carburetor in the front.