Ok now that the flash is it and what has been done is advance timing, would using stock plugs on stock boost be a smart safety precaustion or not necessary?
I'd put them in regardless....... I havent got my flash yet but put them in, in preparation for getting my Joe P MBC and I've noticed a slight difference. Starts up a bit easier, doesn't idle as rough, and when I 'boost' it doesn't seem as rocky (but very minor changes).
PS: if you for some reason have absolutely no clue on replacing spark plugs on the MSP I'm doing an FAQ page that happens to have a step by step picture by picture guide for the colder spark plug install
(yeah i know it's probably the easiest thing on the car but there are always some people who have no clue...... my guide page will aim to cover every single thing imaginable with the MSP)