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I've autocrossed my Chall T/A since 1975 in the SCCA Solo II events... car is currently nationally prepared to run in class E/Street Prepared (since its class inception ~1986). Although I've always run a mechanical fuel pump, I've never had any fuel starvation problems.. In fact, I've always preferred to run the auto-x events with as little weight as possible... typically starting the event's day with about 1/3 tank of gas... ending up with about 1/8 tank... tank is factory stock. One note -- if you run a Challenger with more than 1/2 tank of gas, or worse with a full tank, you'll not only have all that extra weight (bad!) but the fuel will probably spill out of the side-filler onto the quarter panels unless you have a very good sealing gas cap, and perhaps wrapped with small cloth soak to it up.... The g-force in such events can be pretty high to force the fuel up the filler and beyond the gas cap... from my experience!
Your Challenger is obviously not fuel injected, I suspect you missed that difference between your setup and the op's.
When I FI'd my Diplomat the in tank pump would suck air at anything under a half tank if I drove it hard. Under a quarter tank it would suck air in almost any turn at any speed above grandma speed.
Same basic tank design. My solution was a small surge tank fed by the mechanical pump, the surge tank would feed the EFI pump.
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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