i have a duster with me in it it is 3120lb or so.
i have ported heads though with a 262/265 about 640 lift solid m1 intake and dominator around 13.5 compression aside from the porting we should be able to compare i am only 440 cid i shift at 6700 and go through about that. i am 4.30 gears with 30x10.5 slicks.you are 500 and a cam with more duration. mine is @ 110 centerline.
my converter is a 9" lupo in around 5400 to 5600 flash. 60ft is 1.44 to 1.46

i am around 105 in the 1/8 and 130 in the 1/4 lower 10.20s to teens at numidia pa. really cold air at cecil md 9.89 @134. with 1.39 60ft.

i shoot for 13.3 to 1 on my wego3 wide band afr datalogger.
get a handle on your real afr and if you are in the 11s or low 12 i would say there is room to go faster.

one thing i will say is the afr logger will tell you a lot on what the carb is doing. my carb has issues going leaner around 6300 and then almost 1 point richer at 7000.so reading a plug on top end would make the middle leaner. (i am working on that issue)