new parts? good idea... cept block... I assume for lower down time??
If downtimes got a factor u might consider giving in you NA short block and having it built or core exchange ...for just forged pistons bearings and balance so you could start the conversion off with good compression/ fresh foundation. Would suck to get a engine with crap compression in #6 or something. Possibly find built or rebuild heads here, and swap the cost of buying an engine with having a rebuilt/built engine. prolly a little more expensive though. just some dumb thoughts....