what's the best spark plug to use with stock ignition n 100% methanol, also what brand n gap 0.22 - 0.23 - 0.24

 

This is unknown territory but here are a few facts:
The larger the gap, the more load on the stock coils, furthermore, going on the smaller side of gap probably won't hurt the power at all.
Water content in the spray slows the flame and increases spark lag behaving similar to ign retard, also a slower flame front can actually increase the chances of knock.
Colder plugs prevent preignition but can load up at lower loads (BPR9ES work fine on my car at 30 psi gapped 0.022).

 

I would go with 9s also, thats what i use on mine.

 

id go with the search plugs, they seem to work best

 

iriduim 2 step colder it think

 

BPR8es, BR8es or BPR7es at .022.