I need some help picking out a gear ratio..... My setup:

406 sbc 10.5-1 compression
dart iron eagle 200cc heads
solid roller cam 567 lift, 242 duration
hurricane intake single plane
quick fuel 750 carb
1.5 roller rockers
3800 stall th350 trans
3200 pound car
28x10.5 tires
ford 9 inch rearend

I havent ran this car with this combo yet so i have no idea where to start... desktop dyno says the engine makes 518torque at 4500 and 504hp at 5500 and 497hp at 6000 so i was hoping on crossing the line at around 5500-6000. I have a ford 9 inch rearend with detroit locker 31 spline axles, my guess was a 3.89-4.11. The tires im going to be running will be 28x10.5 drag radials or slicks. If anyone has any experience with a similar setup please help me out so i dont have to buy 2 sets of gears... thanks alot

 

here`s those two gears in a tci calculator @ 6000 rpm and 8 % converter slip

 

so it looks like a 3.89 will be best then. If the combo actually does run a 11.5 or so.