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65 Bcuda, 318, Holley Pro-Jection, Thought I'd throw my two cents in. Since I didn't have a return line available I added a 3/8 line as the new supply and used the original 5/16 line for the return. Punched a hole in the filler tube and sealed a 5/16 SS nipple with JB Weld. A smarter way would...

Sounds like a vacuum leak to me. things to check, distributor vac advance connect to carb "ported Vac", PV valve working properly, double check carb primary and "Most Important" secondary throttle plates are closing. If you have a points distributor check the gapping, twist the rotor to see if...

Info only: I gained 17% increase in gas mileage going the Projection route. That's ~20 mpg highway, 17 mixed. Another 2 mpg plus added performance when I swap back to 273 heads, but I take a real hit in >4800 rpm range. Rough estimate of 2 year payback at today $4 + per gal pricing and 10K...