sbc 350 with standard bolt on upgrades, mild cam ect. I'm building it around 350 horse so not real beefy, I'm a budget builder so I kind of have to make do with what I have or can afford which leads me to...I have a fresh rebuilt 700r and then theres the 4 speed Saginaw but I'm going with the 700. Cars I've done in the past were already together and I didn't rod them just got them running so this is new to me and I thank you for the quick responses.