Do you know the compression ratio and octane rating you will use?
I have a 505 C.I. 440 block that has right at 10.08 to 1 compression and I'm going to use Champion RC12YC on our local pump swill. I've had other pump gas motors with a little more compression, 10.78 to 1, that I used champion RC9YC and Autolite AR3911 non resistor race plugs and AR3910 non resistor race plugin them with good results
I went out to the shop and got couple of other Autolite resitor street pump gas plugs, 3924 and maybe 3925, which is hotter, if they make that plug number now
Good luck, let us know what you use and your results