or do what a friend of mine did he found a 65 327 form a vette built it the right way and dropped it in his 79 z-28 sweet engine sweeter car it was dynoed at 433 hp and 463 lb. ft. of tq runs low 11's and has always been a street car but the 400 is also a good choice either way if you build the motor right you will have a wickedly fast car