Same basic setup I have 400 with 440 crankshaft so it is a 451. It came with a 400 but this is not the original one. This is my 2nd one and I had a 440 in it for years. But I've had it since mid 80's and street raced and drag raced it at track for almost 10 years. I kicked so much butt over the years it ain't even funny. My favorite prey was older hot rods from 60's anwd early 70's . They always thought a car from 1976 couldn't run with them but they were wrong. I found that a low gear I ran 3:90 was a big help and I always ran 1/8 mile. Mopars are awesome!!!