Need spark plug recommendations

Getting ready to soon fire up my new 400-470 stroker and need plug recommendations. It will be changed to EFI after the initial startup. For now it has a 950 and some motor specs are 11:1 comp, .586 lift comp cam, stealth fully ported heads and will be topped with a Indy Mod Man dual quad intake for the EFI. I am hoping to get away with a fuel mix of 93 octane with some cam 2 mixed. Thanks All