Be ready for some sticker shock. Proper rebuild on a Type 616 can cost almost as much as a 911. The last (real) 912 was MY 1969. You might want to be reaching out to guys in the 356 Registry - the 616 is basically the 356SC engine. For some reason I thought the car was in Hawaii... The guys at Competition Engineering
Invalid Link Removed used to be the go-to place for machine work. My personal recommendation for P&C's is LN Engineering Nickies
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Brakes is nothing unusual - your standard solid rotors front & back. Eric Shea at PMB Performance is the guy there
Shop PMB - Catalog for caliper refurbishment.
A big-ish issue will be the front struts. The earliest used a fairly bizarre type with a bolt-on steering arm. Those, the weird ball joints, and the A-Arms have been NLA for a long time. But it was a popular upgrade In The Day to use Koni or Bilstein struts so - you might luck out.
Before investing a bunch of money and effort, have the torsion tube checked out. It is *very* common for those to be rusted from the inside-out even when they look perfect on the outside.
At some point you will need to decide your goals for the car. It can easily take 6 figures for a national-level Concours restoration. Just "solid driver-level" can hit mid-5.