This is the very reason I use a cylinder pressure tester. I bought it from Assenmacher(?) some time ago. I tried to buy a larger one ( 4 inch bores.. up to 6 inch.) last year but they told me they stopped making them.
It uses bolts through two swing arms to hold down a rubber sealed plate to the top of the cylinder bore gasket deck. It has a shop air line attachment so you can use your 'leak down' tool to see if each cylinder is good, or needing attention before you fit the cylinder head.
Saved me many a time and do this to new motors I build too.
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