Don't know if they are still available but Silva-lite and Badger made 302 Pistons in Cast.I built a 302 SBC in the 70's they ran about $85 a set,I had the 302 in a '63 Nova ran it street & strip for 2 years+ till i sold it Just make sure you beef up the rods and rod bolts and get a quality engine balance,302's can really turn RPM's.