gap

I will be running a Gen 2 2.3 Whipple at roughly 17psi of boost and would like some opinions on spark plugs and Gap. On my Ported Eaton setup, I had NGK TR6 gapped at 0.32. Should I stick with the TR6 or go to the TR7? Does a 0.25 Gap seem too tight for that setup? Then a matter or Copper vs...

Anyone running 20mm spacers with the 19" PP Wheels? Trying to decide between doing the spacers or lowering springs. Just hate the wheel gap.

Can someone help me out here? I've looked around and can't find a thread on the combination of reasonably high boost for 93 octane with the cams (9:1 Compression on built motor). I was hoping someone could confirm TR6 is still the right plug and what gap to use with this setup. Thanks!