it wouldnt run 10-15 seconds if the timing were 180 out. I think either your timing is retarded too much, serious vacuum leak. Even though you have tried 2 carbs, I would borrow a KNOWN good carb off of a running vehicle and try it.
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70 Formula
Old engine:
467 HO headed
6.79 1/8th mile @ 101.87 no N20. 1.44 60ft
6.23 1/8th @ 111.83 w/nitrous
1.37 60ft
New Engine
IAII 535
Calvin Hill Eheads
Few test passes made. Tore it up. Just got it fixed.
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