could the intake be holding my low end down?

yellow rose said

Exactly.the number 1 reason why guys lose bottom end power with a single plane is the carb is too big. You can usually tune around it, but most guys don't. A dual plane intake will take a bigger carb.

Done correctly, and DP intake loses every time. In both power, driveablity and fuel mileage.

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I don't mean to hijack the thread but you're saying if I switched to a single plane intake on my 360 (after switching from 2.94 to 3.55 rear gears) I could still retain the same part-throttle drivability and off-idle torque of my Performer RPM while still picking up HP and tq? It's a stock 5.9 Magnum short block (9:1 static comp) with ported Eddy heads and that custom-grind hyd. roller cam I've mentioned before, 222/224* @ .050" and .546/.542" lift (I think, lift numbers might be slightly different). Also running a 750 cfm Holley Street Demon and Hedman shorty headers. Mostly street-driven but getting ready to take it to its first time attack track day (road course/autocross), area under the curve is more important for me than peak HP to pull me out of the turns.