runing out of idea´s on what to improve

i have run out of idea´s on what to improve within reasonable cost

its a 73 duster
weight: 3200lbs
tires are hoosier quick time dots P275/55D-14

-69 340 fully balanced bottom end everything checked and machined to perfection block halfway filled with hardblock
4Bolt billet maincaps

11.0:1 compresion

fullported J heads with 2.02 intake 1.60 exhaust valves

holley strip dominator intake manifold

edelbrock 800 cfm thunder series AVS carburator

solid roller cam 264/268 duration @.050 lift .630"

msd probillet distibutor msd 6A ignition box

TTI step headers conectet to a full 3" mandrellbent exhaust with 40 series delta flow mufflers

stock suspension

904 transmission with transgo competion shiftkit and extra clutchplates
2800rpm stall converter

8 1/4" rear with 3.21:1 gears will change those thise winter but havent decided if i should use 3.90:1 or 4.10:1 gears

will build somthing looking like caltracs to

subframe conectors are already added

what is good upgrades for this combintion?
any power estimates? will dyno this baby in mars or april...
it runs hard allready but i still want more
its mostly a streetcar but it will see some racing both on the street and strip

of course it is a real streetcar with full interior and it runs on pumpfuel and works great for cruisenights to real headturner when it idles rough @900rpm
redline right now is 7500rpm