I ran a Hayes aluminum/steel insert FW with 3400# 3- finger Direct Connection pressure plate in my '68 Charger 440. It was easy enough to drive with 4.10 gears but required much more care with the left leg. With 3.55's I wouldn't want my driving to be 75% traffic. On my new 'touring' build, I went back to an all steel flywheel, centerforce clutch and a 505" motor. If I was racing any more than infrequently, I'd still be using the aluminum wheel.