Poor Performance, pls help
 

Hey guys, Anyone know what could be causing my 5.0 to bog down while reving it? Here are the specs: 1985 GT w/1987 roller motor, Weiand Stealth, Mallory Hi Fire Ignition(new), New wires, spark plugs, Rebuild Dist. New cap rotor. Hi-Perf Cam. Tried both a used Holley 650, vac sec, and an Elderbrock carb w/similar results. The car is using the factory in tank fuel pump(used to have CFI), Holley fuel pre regulator. Set to 5-6pounds.
Hooker full length headers. No mufflers yet.
It seems to idle fine, just when you rev it quickly, it seems to bog down. Any ideas?

Thanks....

Maybe Timing? to much or to little of timing could cause such a condition. maybe wrong plug gap, are you using a 86 model distributor? or what vacume advance working properly?

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SOLD THE 87GT, .. GT40, 70mmTB, 75mmBullet, 24lbinjectors, cold air induction, Edelbrok 6025 Rpm's, Inch phonolic spacer, tall FMSvalve covers, an SFI balancer, Canton 7quart, the shortblock... Lunati 51025 (224/232 .535/. 544 @112 deg) Ross lightweight pistons (10:1) Eagle H-Beams, Total Seal plasma Moly Rings, Clevite bearings, ARP throughout, FMS main Girdle&Studs, Forged Crank, of course HV-OilPump and hardened FMS shaft, Dual Friction centerforce, T5, and 4.10's Longtubes and 2.25 tail pi