I have a friend that is looking at buying a rebuilt 12A short block for his 1983 RX-7. I already know of Atkins, Mazdaspeed, and Racing Beat. They want too much, I know you can find them cheaper. I bought an used J-Spec 13BT like 2 years ago but gave all the info to the guy who I sold the car to. The place was in SC or NC. I paid about $900 with shipping. The engine is supposed to have about 60K on it. Any help would be appreciate.