Heres my 1966 Valiant Signet, its originally a 273-2bbl & 904 with 7 1/4 rear
when i bought it, it had a 318 in it & it came with the original 273-2bbl
1 year ago i installed a 383 magnum with 727 & 8 3/4 posi (3.23 gear)
i recently took the 383 out & im going to replace that with a 1966...