Transmission Choices

[twertsy]

Morning all. I've been attempting to research manual transmissions for my GTO build, with little luck gathering the information to make a decision. So, I thought I'd ask your thoughts and recommendations. This is a "pro touring" build, with a butler 505 and anticipated ~750 HP. It has a 4:11 12-bolt posi. Who builds a manual transmission that you would recommend that can safely handle the HP/torque? I'm thinking at least a 5 speed to compensate for the gearing but possibly a 6 speed? Any thoughts/recommendations greatly appreciated!