You're not too heavy for a nitrous car making the kind of power you are. For a slower N/A car, yeah it'll be a turd out the gate.

I suspect you're in the same boat (pun intended) I am. My car is a sled (nearly 3900 lbs w/ driver), but makes good power...and w/ a 727 on small tires (radials) it can be a challenge getting it to 60'.
I have friends w/ 3400+ lb nitrous cars w/ glides and they run REALLY good. EVERY one of them has been on me for years to put a glide in mine, but only the $$$$ keeps me from doing it.


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax