New guy motor swap.
 

Totally new here! I just got a 72 RX2 without a motor. The rest of the car is there. Im wondering if Mazda changed up bell housing bolt patterns? What mills would bolt up to my Transmission? Also is there any good books out there that a new to everything Mazda guy could learn alot from? Im going after performance so I am open to any mill that I can make work in my ride. Even open to picking up a donor car. Any help would be appreciated! I notice alot of people running 13B mills from everything from stock daily drivers to big HP drag cars. Is the 13B the way to go. Sorry for all the new guy questions! Thanks again guys!!!!

If you don't get any answers back you may want to try and post this question in the oldschool section here: https://www.rx7club.com/old-school-other-rotary-63/