J (915) vs. Magnum heads

Thanks for all the technical advice with all the differences between both heads. I enjoy reading them all. Im sure this gives other people that are uneducated about heads some good info. I know I appreciate it.

I can also tell you that Im just going to stick with my magnum heads. Even though I have everything to do the swap with the exception of the new valves. I'll save my money for a new torque converter!