Welcome, first
Second, I'd say you will get a lot of responses here saying that you will do well to talk to a couple other members that specialize in this area. - are we talking engine rebuild, then talk to McMark in Michigan.
Also There is a Master Porsche mechanic right here in South Carolina that has 40+ years experience in air cooled motor rebuilding. BillH1963 has had him do some work on ish 911/6 but George does everything- ive seen a beautiful 356 there just finished as well. Ive not had my motor rebuilt because my compression is good but, if I were going down that road, i would Call Bob Woodman - Bob Woodman Tires, Inc.
don't let the name fool you. - these guys know aircooled Porsche motors as well as anyone in the country.
843-524-8473 Beaufort SC
Their reputation is excellent, -
on west coast I am sure there are a lot of options, more air cooled places there, Fat Performance is one ive heard good things about.
Phil