What spark plugs to use?

[superbird6bbl]

I just installed a new set of RHS/Indy Cylinder Heads LA-X heads. I have a .484 Purple shaft,air gap intake, 750 Holley ,4200 stall, 904, 3.55 gears, and 9x28x15 Hoosier slicks . I run 1/8th miles Bracket racing. Thank you.

 

[K.O. SWINGER]

autolite 65 what I run strong and dependable, but I run a hot Factory X headed 345 never a problem .

 

[superbird6bbl]

autolite 65 what I run strong and dependable, but I run a hot Factory X headed 345 never a problem .

Thanks K.O. I hand started the plugs but my regular spark plug socket wouldn't go into the hole to tighten them?? Do the RHS LA-X heads need plugs for Magnum heads? I had to buy Magnum head bolts since the LA bolts where too short, except for the longer one on each side.