Exactly! With the fuel bowls filled completely up that will be more than enough fuel for the engine to run on til the fuel pump primes. It only took my old chevy camaro 350 about 3 or 4 seconds to draw fuel into a 3/8" fuel line to the carb and thats with all new plumbing and tank. So everything was bone dry to start with. You will be fine just priming the carb by filling the bowls through the vent tubes. I would also do it right before your ready to fire the engine over so if you do over fill the carb, the fuel doesn't have much of a chance to run down the intake and the cylinder walls to wash out the oil film.