Feel like my 440 should be faster

Is a 2500 stall correct for your cam, gearing, tire size, and weight?
Also, you may want to calculate the exhaust diameter needed for what you have. I calculated out 2.5" is best for scavenging for my 360 with my promaxx cnc 185 heads, Doug's headers and h pipe.
What do your heads flow? I did not see you mention heads. That's kinda critical.