I would appreciate some advice on what type of spark plugs to run in the following motor.

454 BBC
Merlin 345cc 119 cc open chamber
871 blower 10% under driven
2 750 holleys
Isky hydraulic roller
9:1 static compression
12:4 effective compression at 6 lbs. boost

Street driven and all I was told was to make sure I use a short reach plug and a fairly cold plug.If anyone has experience with a blown street machine I would like your input.Thanks