serious street power.

ok guys, i have been sqweezing what i can out of my 440 dart.
more or less its a 68hp motor highish compression, alum heads, ,509 purple cam,stock bottem end....750 holley carb/intake/ so on....
Compression dropped a little but is still stock bore and pistons so its probly just worn...
Before my last race the car was in the 12.80's .... then after few upgrades on the car and motor includign alum heads and better intake it ran slower haha.
I would like to get some big easy power.... the motor is coming back out again to re-ring and bearing it. and i cant go bigger cam since my stock pistons have no valve reliefs so that means pistons as well.
Shoud i just re-ring,bearing,gasket, and get new pistons and a huge cam.... or go all out and just buy the 440 source stroker kit... probly the 512 then go maby a little more cam later on, but probly not rite away due to finances.

Just rather get huge power that can be street friendly. im using it for mainly weekend cruizing and occasional strip use.

I figure a stroker mite be good since im already ripping into it and taking it into the machine shop and going .30 over and all that.
Also with stroker motors how do you figure cid?
i know the formula and all but it says a 512 cid motor is with stock piston bore i think but if you go .30 over with the formula it takes it to 570!?
is it really considered a 570? or still a 512?