[mgarblik]

Originally Posted by PAUL K

A 4" stroke engine usually has a wider power band, more fun to drive with a stick. The 4.25 engine usually develops more torque and will make things harder on the driveline, mainly the transmission.

This is basically my feeling too. No hard scientific data. In the driveline, the Muncie or T-10 with a single disc clutch is the weak link. Those little lightweight transmissions were never intended for 500+ ft. lbs. of torque. The only saving grace was the tiny lousy tires the cars came with back in the day. Good pair of tires and the transmission becomes a basket of aluminum cole slaw. A turbo 400 with the right converter can control and use more of that brute torque. But I love stick cars for street fun. In the end, probably doesn't make a big difference, more based on how you drive it.