Changed intake gasket, now it won't start

Finally got time to test compression on 5 and 7. (Stupid header). About 132 each. Both spark plugs where cracked, 7 had a white tip and 5 was black. Changed the plugs and it is running the same.

Best was to describe the sound is a rhythmic slapping sound. Blap blap blap. Just doesn't seem right. Still doesn't like to idle at 600-700.

Motor shakes a lot. Causes random "cavitation" sounds in the cab.

Doesn't have the power I expect.

Is the discoloration on the plugs telling me anything? 4 are perfect color, 3 are black sooty and one had a white (hot) tip.