emjay
+1y
i swore that Dan did sell engines. Over on MT the owner of Atkins Rotary is a member, goes by Atkins_Dan. Try dropping him a message there, I'll tell him about this thread here as well.
The 13B and the 20B will work with your transmission gearbox, but you will need to swap your bellhousing with a rotary one. To the best of my knowledge, it is the same bellhousing used between the 13B and the 20B, Dan will know the answer to this. I'd use the RX7 gearbox though, gonna be stronger with better gear ratios.