Not Ranked
Just an adder to Tom' note on concentricity of the bellhousing. This is not just for the bolt holes. It is to assure that the "hole" in the center is lined up with the crankshaft.
The bellhousing is mounted on the block without the flywheel. A dial indicator is mounted on the crank flange and the "hole" is "swept" with the dial indicator by rotating the crank. It is a job for an engine shop to perform. If things don't line up, they have the necesssary equipment to make adjustments.
On the flywheels, I bought 40# steel unit (McCleod) and had about 18# machined off. Best of both worlds. Lighter than stock for quick revs and the toughness of all steel construction.
One other note that I haven't yet heard anyone mention about flywheel weight. A heavier flywheel dampens the effects of a "lumpy" camshaft, making the idle a little smoother. The lighter flywheel lets the engine lope more.
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"If some is good, more is better.
And too much is just enough."
--Carroll Shelby
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