I saw the metal clamp come apart on a friend's 350 and roach the piston. It wasn't any better than all those worthless plastic ones.
You could get more precise with a drip method with an even administration.A small air leak will not do what it's doing but more likely to lean and In most cases act up (lean) when hot. Not saying there isn't a crack in the plate OR ELSEWHERE. I would do what I said and get a spray bottle with gas and start it and regulate it this way. Abviosly pushing the choke in as soon as you spray it.
Now you have ruled out most everything.
This brings it back to the carb, filter or gas line.
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