[Zeke]

These days, 356 motors are about the same as early 6 cyl motors. So, if it's a good looker and checks out compression and leak down wise (I know you said it was just rebuilt, but I'd want to see some numbers), then you could get towards 5K, IM(very)HO. What with some pieces missing, either find them and make them pretty, or subtract for same.

Justify? Well, cases and crank worth at least 1K. New PC's cost close to 2K. That's only 2K left for the rest including the recent machining. Plus, it's an S.

That's best I can give you and I'm no expert. I just noticed no one wanted to take even a guess in this many days.