as far as i know, they don't make a smallblock ZF tranny. The small block tranny is a Mazda M5OD, which has a slightly different gear ratio, however, if you want what a ZF has, theoretically, you can swap guts from a ZF to a M5OD. Anybody else know anything about this?
The smallblock ZFs are scarcer than hen's teeth and SUPER expensive. I had the opportunity to buy one several years ago for $800 delivered (which is an excellent price), but I didn't have the loot to lay down then.