Sorry, 25R and 20F. Mcustodio

Mr. Bonanni, don't know too much of building my Z into a well balanced car,my goal is to gain at least 500horsepower in the wheels itself. right now my buildup is onlyfast intentions exhaust w/18 resonator CBF. H&R spacer 25R & 20R. that is all I have. everything else is stock. wonder if you can give me an advice where to start,I'would greatly appreciate it. Thank You M.Custodio