I agree with not running the engine really hard or WOT for the first few miles, but not 500-1000.
I would strongly suggest at 100-200 miles to pull the oil filter and cut it open, it will tell you IF you need to pull the engine back out or can start running it like you stole it!
There are a LOT of things to check when you have a HUGE stumble/hesitation/bog going quickly from idle to full throttle. The engine/drivetrain/vehicle specs and carb/distributor details would be helpful here......
I feel your pain with Youtube videos, I get ill trying to watch any related to carburetors especially Quadrajets. 99 percent of those folks need to shut the camera off and go as fast as they possibly can right back to their "day-jobs"!..........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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