Just say I want to rebuild a spare VR6 engine in a few years, and to spread the $$ damage out, can I possibly start stock piling individual parts such as pistons, cams and other parts (suggestions please) or do I need to pull the engine apart for measurements first?

Obviously rings, bearings etc will need to be done at that stage, guess what I am asking is can I get a head start with some of the goodies parts?

Cheers
Ross