Your welcome...[.there's always something forgotten off these lists]. Before getting involved with real high rpm tuning it's good to have an assortment of head and liner shims, plus an assortment of props. Once you get the compression backed off so far that the engine barely runs, then bring it back up gradually to where it makes the engine seem happy, but still making soot. You always want to start out undercompressed, nothing gets harmed this way.
The prop is a fine tuning tool, too. If you aren't willing to scrape, chop, modify, the odds of finding just the perfect prop right off the shelf aren't good. The load on the engine plays a huge roll in plug life, heat build up, detonation, etc. Sometimes you get lucky and find a stock prop that's perfect. Eliminator has an "infinite" selection in some size ranges.
We're talking about high timed, piped engines.....not the lower rpm sport stuff. Sticking a pipe on a low timed sport engine is much less critical....but can still require a fair amount of time to get sorted out.