They don't make "new" Q-jets unless you bought one those Chines POS off Ebay.
Most likely the carb is assembled with the wrong parts. A windowed N/S assembly and POS pump seal will require considerable cranking after sitting a few days. The factory eliminated the windowed N/S assemblies in the mid-1970's the help prevent drain-back after shut down. These new "blue" accl pump seals swell up and don't allow fuel past to fill the well under them so poor pump shot for restarts. I've seen them so bad you get no pump shot at all. Every single time folks blame the problem on drain back or leaking bottom plugs in the carb and the problem is simply the pump seal too tight in the pump bore.......FWIW.....
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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