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Post number 56

Yes the mixture screws are sticking out too far. You should check for vacuum leaks.

Are you using an original air cleaner?

If you want to know what it is, then just raise the timing to 20-22 degrees and let the engine get to operating temperature and then try to see if the hesitation is gone or almost gone. Then you can put the ignition timing back to where it was, if you want to. That does look like a 4 speed carb.

If the engine does not ping under full throttle then try and advance the ignition timing a little more.

Try advancing the ignition timing to 15 degrees to see if the hesitation goes away. Also try removing the vacuum advance hose and plug the port. The gasket for the air cleaner is missing.

You will need a flat head screwdriver larger than the one that's in the picture. Turn the screwdriver counter clockwise until it climbs up the gear (more than the last time) then turn the screwdriver the other way until it's all the way down. Keep doing that and it will come out. I would not...

If the timing is moving by itself then check to see if the distributor is loose (with the engine off)

Before removing the valve cover I would put a teaspoon of oil in the spark plug hole and do another compression test.

Those 915 heads might make the compression higher than 10 to 1 34 degrees with the distributor vacuum hose disconnected.