well when you are saying you want an NA bottom end you only have two options the L36 and L26. after seeing that the L26 is weak... then it is easy to see you want an L36. this was my choice as well. I got my trans, engine, and topswap kit from Morad and was pleased with the level of service. I was able to get basically everything i needed for the 3800 swap from a 98Z34 to put into my 96z34. It fired up first try.