timing/tune up problems

the stop bushin only stop the amount of mech advance, the spring stiffness is wat will control the rpm range, so i think the 25 stop bushing miht be ok so i can run intial at 8-10 degrees and if i change to lighter springs the i should be able to get all in at 2200, 2800, 3400, 4000, 4400 or with the heavy springs i have in right now 4800.

what do you all think is a good timing curve on a stroker? i am mostly street driven but hope to get a few passes on a local drag once or twice a season