Rebuild Options, Looking for suggestions for sizing Options

[staitleman]

I bought my wife a 71 914-4 that has only minor rust. I always figured that if I find one that’s not about to break in half I can sort out mechanicals later. This one runs fine, will need a clutch soon, but everything works. So I have a good starting point.

I’ve since acquired a sideshifter from a later model and the associated linkage. I’m now seeking an engine case to start a build. My plan is to assemble the motor during the summer and have it ready when it comes back from the body shop after a season of driving, then mate the new motor and gearbox. The gearbox btw is being rebuilt by an old friend who’s a former gearbox engineer in formula one, so it’s getting a rebuild like no other.

There are a ton of options related to bore, valve size, carbs, etc. I’m looking for some sort of template I could use to determine which bore goes best with which valve size, carb size, etc. without such I’ll end up all out of whack.

If anyone has any examples of how they formulated their build I would be forever grateful.