i was wondering what is the difference between the BB frame mounts and the SB frame mounts. is one set shorter than the other? is one set made to offset the motor a little to the right? i,am real curious about this??

Yes, drivers side is about 3/8" taller and 1/2" to the front. Pass. side is about 3/8" shorter and also about a 1/2" to the front.

There's a big post on this if you would like to do a search. I also posted the motor mount sizes somewhere too. pdq67