360 does not seem to be making power and is slow in the 1/8. Need help and/or suggestions

Hello FABO racers,
We are having some issues with our 360/727 combo in our 72 Demon. It seems to have a hard time making power and is extremely slow in the 1/8 mile.
We initially set out to build the car to run at our local 1/8 mile track. We set out to get the car to go mid 7s (7.40s-7.60s). Here is the combo:
360 bored .030 and zero decked
KB107 flat top pistons
Stock crank and rods with ARP hardware
Howards flat tappet cam .510/.510 lift 247/247 @.050'' with 108* lobe separation
Edelbrock Performer RPM intake, topped with Proform 750 race carb (unsure of jets; carb came off of a 69 camaro with a healthy 383 stroker). Based off of compression calculators; the motor should be around 9.9-10.0:1 compression.
Heads are J heads with a just a little bit of clean up work done. Also have Ferrera 2.02/1.60 Stainless valves and new Valve springs to support the cam.
Fuel pump is a Carter Muscle car fuel pump, 5/16 line that provides 6psi of pressure at idle
The trans is a 727 with built internals, a turbo action reverse manual valve body. The converter is a 10 inch converter that was rated for like 3500-3800 stall but on this it flashes to 3000 rpm.
Rear end setup is an 8.75 with Moser 30 Spline Axles and a Strange 30 Spline spool with Richmond 4.30 gears.
As previously stated, the we were shooting for mid 7s (7.40s-7.60s) in the 1/8 mile with this combo. We set out to test the car at the track and the best time the car turned was a 9.03 @76mph with a 2.05 60 foot time; which seems extremely low even for this combination. My son said The car seemed to be breaking up at 4000-4200 rpm and up when he was making his test passes. We had a hi-rev 7500 ignition box from jegs on the car with an Accel distributor that was similar to a stock Chrysler distributor with lighter advance springs in it. When it made its best pass of 9.03, the timing was set at 34* total, my son built the converter up as high as he could at 2,000 rpm and he said it seemed to want to push right through at 2100 and the car was super slow out of the hole, seeming to be laboring itself down the track. We have been recommended a few different things to get to the mid 7s range with it (11.70 or so in 1/4 mile). We have been told it may not hurt to change to an MSD ignition setup, also change the Cylinder heads to aluminum heads to raise the compression and get better flow. Also people said to change the fuel system to 3/8 line and pump. and last but not least; changing to an 8 inch 4500-5000 stall; along with different heads, fuel system, and MSD setup to get to mid 7s versus the 9.0 we are at. Any help and suggestions would be appreciated. Would it be more beneficial to go to Edelbrock or TrickFlow heads, would a 4500-5000 stall be too much or just right, and What other changes should we make? We can try to send a video of the run and pictures of time slips if that would help.
Thank you for your help in advance.