Practically nothing, except what was in there originally, will be a direct drop in. Although I love Richard like a brother and have known him since Christ was a Corporal, I'll have to disagree with him on this one. Some of the things to take into consideration are motor mounts, driveshaft compatibility and length, extra added weight on the front end, adequate cooling capacity, and exhaust modifications amongst others. To get an idea look up junkyard girl's thread on putting a Caddy in her 72? Monte Carlo.