Engine Combo's that turned out terrible?

My first race car was a 66 cuda with a 340 out of a 71 Duster. I was just starting out and I subscribed to the bigger is better theory and bought a Cam Dynamics 300H, which was pretty much the biggest hydraulic they made. The problem is I ended up with a stock 12 inch torque convertor for the 727. That car would leave like a dog, and then it was like someone grabbed your shoulders and pulled you back into the seat at 3000 RPM. I actually won a lot of races in that car, because guys got out on me and figured they had me covered and started to back peddle, and I would pass them on the top end like a freight train. I later put a proper convertor in it and I think I got it into the 11's

66 racecar.jpg