My opinion would to be just rebuild your 302. Its alot less $$$..
Try boring it to a 306, TF TW heads, TF TH intake, E cam, Forged Pistons, 150 shot of nitrous and you will never have to worry bout those z' again. That is unless they are built up too
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347 Stroker Motor: Balanced, Tremec, Extrude Ported and Polished Upper and ported Lower, GT40 Milled Ported and Polished Heads, B303 Cam, 30lb Bosch Injectors, Holley AFPR, March Pulleys, Perma-Cool Fan, 3-Core Radiator, Accel Performance Coil, Accel 300+ Wires, Ram Air, K&N, 73mm MAF, 70mm TB, FlowMaster w/BBK Offroad H-Pipe, BBK Headers, Hurst Shifter, 3:73 Gears, Ram Clutch, Cross Drilled Rotors, AC, smog, and rear seat deleted, battery relocated
Awaiting new heads, intake, custom cam