Building up a 383 with GMPP Vortec heads #12558060. Heads are designed for use on SBC 1958 and later. Block from a '71.

Static Compression Ratio = 8.6
Dynamic Compression Ratio = 7.4
180 degree thermostat
4 Speed manual
Daily Driver
Not high RPM, well maybe once in while
Want to use 87 octane

Probably start a little cool on the plug and get hotter as I see effect on plugs.

Anyone have ideas on particular plug part #'s I should start with using these particular heads and application? I hate to admit it but I'm clueless!

Thanks,

DoubleSun