Sounds good.
The slight hesitation will probably be from being a tad lean, you could go larger on the main jets, but then mileage suffers.
Accelerator Cam adjustment, ,squirter size increase, air bleed jets, different options to get it tuned just right, so it will not get a hesitation or back fire.
Back fire through the carb? If so, usually a lean condition.
0-60 MPH 21 seconds? If so, that engine is worn out.
My moms stock 73 4 dr Nova, 3.08 rear gears, powerglide ran 21 seconds in the 1/4 mile 3000 FT altitude track.
Adjusted the timing, got it down to 19 seconds in the 1/4.
Non of the two 6 cyl cars I had used a flame arrester. 73 Nova, 69 Camaro.
They used a filter just on the inside edge of the air cleaner assy.
MBHD
