distributor curve springs?

question to anyone who has done this....
got the kit from FBO... his ignition box, no ballast resistor, petronix coil, spoke to don, stated to use the 18 degree slot, base at 16 and 30 total IDLE WITH FULL MANIFOLD VACUUM. NOW ADJUSTED VACUM POD TO @5 inch lbs of pull.... stated to have advance in around 3K +/- 500 rpm..... but never stated which springs to use..... the dual heavy, dual medium, or dual light. .... or combination of 1 heavy, and one medium or light... I have a stock dodge standard, not elongated, and mr. gasket light and revs awesome, but won't idle well. took it out to re-curve properly. have access to distributor machine, just trying ot get a clue where to start my spring weights for first time,,,, haven't heard back from don... any suggestions.....
73 dart swinger full body car, @ 3K lbs 318 build 0 decked 9:5/1 compression, 93 octane, 302 casting heads, air gap intake 600 cfm, 100 shot nos.. latter on..... a904l/up.. and 3:50 gear with 28" tall rear tire... anyone have done this?