bellhousings

if i understand correctly you want to use the bellhousing that is with the truck motor... if that is correct then, no that bellhousing wont work, they are 11" truck bellhousing and do not have the car 3 or 4 speed pattern on them. they have the truck NP435 pattern which is nowhere close.

as far as the rear goes it is probably the chrysler 7 1/4. being a /6 with the 3 speed it may have the 3.23 ratio, but its probably the 2.76 ratio as it was all about fuel economy in those years, yes the 7 1/4 will hold up fine to a stock 318 chrysler actually built 318 v8 cars with the 7 1/4 rears from factory. i actually had a 68 dart 4dr that i swapped a 360 into it was running 13.30's in the 1/4 with a 2.76 geared 7 1/4 rear. i never broke it!! but i didnt run slicks or drag radials with that rear im sure it would have broken then...