Your problem may be "vapor locking". This is where the fuel get hot and basically evaporates before it get to your cylinders. They make special insulation to go around the fuel lines to deflect the heat, or they make cool cans in which you fuel line runs through basically a small can which is filled with ice. I would but a cowl hood and move the fuel line to where it's not close to the exhaust.
Good Luck!
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82- 347, SVO A4, Scat Billet Crank, Crower Rods, Nowak Pistons, TFS Heads W/Crower Stainless Rockers, Victor Intake, Gold Claw, Paxton Fuel system, MSD ignition,
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