Where should I start?

I tried to think of the specs that I know for my current combo that will affect its ability in the 1/4 mile. I am new to drag racing as I just got my car on the road last summer and never made it out to the track. So here's what I have,

74 Duster stock street weight (I'll weigh it in the spring)
360 with unknown internals (Does great burn outs)
Stock dished pistons
Mid 70s 360 heads assumed stock
LD4B intake with 670 Street Avenger Holley carb
Stock Electronic Ignition
15 deg @ idle, not sure what it is at all in on a stock vac advance distributor
1 5/8 tube 4 into 1 long tube headers with 2 1/2" H pipe equipped exhaust right out to the bumper
A-904 with unknown stall Torque Convertor
Hurst Quarter Stick Shifter
8 1/4" rear with 3.23 gear and a S.G. diff (About 2800 rpm @ 70 mph)
Mopar Performance Mexican SS springs
Stock 318 torsion bars
Stock Shocks front and rear
Sub frame connectors
Front Disc/Rear Drum brakes
245/60-15 Cooper Cobra rear
215/60-15 Cooper AT-3 front

I know I need new rear tires to start because I have no traction what so ever but after I do that, Likely 275/60-15 drag radials on a pair of 15x8 cop wheels I have, Where is the best bang for the buck in a street legal drag car that won't ever have a cage in it but would eventually morph into a 12 second street car.

I'd like to leave the motor as is for now as it seems strong with good oil pressure and really I'd like to see how much I can get out of it. I in the spring I'll tune it as best I can with what I have. Gears? I have an 8 3/4 housing I can build up for it. Torque convertor? I want to spend my money wisely and learn as I go.

Cley