Thanks for the response.
Im familiar with ZF's being able to turn both ways under full power. For a future project, I may consider building a LH engine in front of such a tranny.
For this one, the motor is done, with all of the RH components already in place (save for the cam). They arent necessarily hard to find (if you know where to look), and with the exception of the cam, no more expensive. Ive heard good things about the ZF, but the BW 72c is tried and true, especially in front of a big block.
To swap the rotation of this engine, Id be looking at a new timing set, starter, rear main seal, and transmission. Im also unsure of the ZF's length- we may need to pull our shaft and adjust the length too, if we swapped out the BW. All those items would cost well beyond the ~$500 premium for the RH roller cam (as compared to a regular LH roller)... not to mention, a lot more work. I think we'll stick with a righty for this project.
Just gotta make a decision on the cam!