Flywheel

Depends on what bellhousing you're using. There are two size bells for the Cleveland, either 157 tooth or 164. The six flywheel's neutral balanced, can't use it on a Cleveland. The Cleveland uses the same flywheels the 289/302 uses---28 oz/in.
 
What engine did the bell come off of ? 302 or a 351 ? If it's a 351, it's likely a 164 tooth bell, 302's usually had 157's. You could do a little searching on ebay for "Ford Bellhousing" and see what's listed there as to the casting number and what bell is what.