Well it looks like the fuel line I used between the sending unit and the metal line got soft and bent in on itself. But it was only doing it when the pump was pumping! I only noticed it by accident .
Took out all the slack and primed the line, bam... started up loud and nice. Put it in gear and revved the heck out of it, then backed off. No sputtering or stalling. Hopefully that's all it was!
Now on to getting a rebuilt carb and fixing the trans' leaky "weep hole".
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