318 Rebuild suggestions?

Looks like you've got a pretty good handle on what you want/think needs to be done.

I agree with Trailbeast about the need for/use of a high volume oil pump, I don't think it's needed........however as an out to your preference/peace of mind, wait till the lower end is assembled and you know your clearances, then buy your pump. Two thousands and tighter (just to pick a number) does not need an HV pump........if, IF, you go with an HV pump buy a heavy duty pump drive shaft.

Good luck with your build.