Looks like I'll be using a C6. It came with the motor. I was hoping to run a manual, but I'm not finding any trans without a hydraulic clutch that bolt up to a 460. The scat rotating assembly lists 545cid with .030 overbore. I'm not sure what bore the motor is already, but I'm thinking it's virgin and mostly stock. I really want this motor to be able to turn at least 6,000rpm. Would you recommend the ford racing scja's, or the trick flow heads? The FAST system will supposedly support up to 600hp, and I don't see myself needing that much power in an old farm truck/tow rig. I want a streetable motor that makes decent power that is just as at home pulling a trailer as it is ripping up asphalt.