420 clone build

hey all i used to be in karts about 20 years ago and family looking to get back at it we used to run stroker L heads but we want to run the gx390/420 what is the best 390/420 crank rod and piston combination for max perf in each of the stock bores I'm surprised my login still works lol forgive me if this has been covered
 
hey all i used to be in karts about 20 years ago and family looking to get back at it we used to run stroker L heads but we want to run the gx390/420 what is the best 390/420 crank rod and piston combination for max perf in each of the stock bores I'm surprised my login still works lol forgive me if this has been covered
I have a Vegas Carts 460 for sale that is pretty much a Bored and Stroked 390 with Billet Rod and Flat Top Piston. Its posted in here under Big Block 4 Sale
 
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