Small Block & Big Block Chevy Specific - Need specs on BBCs

I searched and could not find much of anything that I needed. I am looking at swapping a BBC into a small car and I need to know dimensions of a BBC. If anyone knows: about how much more a BBC (iron block/aluminum heads) weighs than a SBC (all aluminum), how much bigger L x W x H a BBC vs a SBC. And if someone could confirm this, after researching some I found a couple places that state that BBCs share the same motor mounts as SBCs, is this true? Also, is it true for BBC and a LSX platform SBC sharing the same motor mounts.

Thanks,
Jim

Is there a different place on the forum I should post this???

Here is a page with weights of just about everything on a car.

http://brian-callahan.com/Brians%20stuff/camaro_database.htm

Thanks man, it'll help