[Vintage914Racer]

I'm cleaning out the garage and ran across the following parts.

Transmission Case: Part number 914.201.302.00

Cylinder Heads: I have four cylinder heads in total. Two look clean, while the others looks a bit used

Clean Heads: P/N 021.101.371 S. Both also have the number "30" circled and stamped on them

Grimy Heads: From what I can tell, they appear to have the same P/N as those above, but have the numbers "40" and "31" stamped on them

I honestly don't know what these are worth so give me an idea. I'd be open to trades as well, be it labor or other parts.