You're trying to keep the flywheel from turning while tightening things up, so put the clamp on the flywheel close to edge of the BH so it can't turn...
Mike B
Mike Boteler
1956 Chevy 3100 Resto Rod 1952 Willys M38 Army Jeep 1983 Jeep CJ7 Laredo 1984 Jeep CJ7 +++++ Silver Spring, MD