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Also this car originally came with a 318 SB 727 but I'm putting a 383 with about 400hp and with the BB 727 behind it... will I have to get the drive-shaft re-sized? Also I'm looking to get a new case with like 3.55 SG gears for my 8 3/4 rear. Should I go with the small yoke for the case or get a case with the bigger yoke? I haven't check but I'm assuming since it was a 318 car the driveshaft prob is for the smaller yoke... I'd love to go all out with new driveshaft large yoke n all but my budget is tight.

Thanks in advance

I have never heard of a 1968 small block b body with a factory 727, but if that's what it has it would work with the big block tranny.
If you need a 727 large yoke & drive shaft I have a extra plymouth set up. PM me if you are interested.