Here`s my 68 Formula-S Barracuda that started life as a genuine H-code 383 4spd. car. When I bought it I found that someone had already replaced the original engine with a 67 383. I rebuilt it to stock first ,then a 383 stroker at 439c.i., now a 440-6 stroker with 496 c.i. and I replaced the 4 spd. with a Tremec 5spd.. I run it on the street exclusively, it`s a fun car to drive.