ok i keep getting rejected from posting a link because i only have 5 posts and i need 10 so anyway there is a 66gs with a 401 nailhead in petaluma ca for 1500 you can see it in the sfbayarea craigslist but heres the number 707 794 1571 ask for corky he says the engine is rare for this model but i dont know
Here's the link: http://sfbay.craigslist.org/nby/cto/1411157643.html Not exactly rare, they built over 13,000 GS's in 1966. But wish I was closer to check it out.