Use a offset cam woodruff key for fine tuning - mr gasket . If cam is advanced more low end, retarded more top end. Remember the stupid big ford 1972+ timing sets stamped 10 degrees retarded for emissions?
Yes, Ford did that through about three decades. The 351M and 400 were about the worst. Especially the 400. When they gave it that 4" stroke, they suddenly found out what a detonation monster they made. They tried everything they could, lowering compression several times, retarding camshaft timing more than once to discover all they had to do was put a quench style head on it like the 4V 351 Cleveland and they'd have solved it.