First time down the track

67Cuda408 said

Oe style mechanical pump, Summit -6 hose to filter and Holley 750 vacuum secondary carb.

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That could be a problem, mechanical fuel pump trying to suck fuel 15 ft through a 5/16" line under G-forces trying to put it back in the tank. Use a 3/8" line, a electric pump as close to the tank as you can, and run a 10 ga wire so no voltage drop.