Remember, the early Chevy small blocks had NO bolt holding the damper on, they were pressed on at the factory! I don't know if I would get real upset if you can't achieve 60 ft/lbs on a street (non-supercharged) engine. as long as you can get 40-45 ft/lbs. and use a blue-removable locktite product to keep the bolt from loosening so the damper cant back off! I know I'll probably get beat up
for this comment from the "manual mechanics", but I have had an early 283 in a work truck for over 20 years with the early crank that has no tapped hole to even install a bolt in, and it has'nt come loose yet.