I had a 67 barracuda coup in my 20s (I am 48 now)
I put in a 383 and had the cheetah manual valve body in it.
Nitrous ,engine done to the n*ts 456 gear 8/3 quarter rear end.
Drove it on the street. Had to get out and relax because of the
noise, vibration and so on. The shifting with that is so...