Are Cylinder Heads 2843675 Open or Closed Chamber?

dibbons said

I had the 318 in my '65 Formula S rebuilt by a local shop, but I don't remember seeing the combustion chamber shape at the time (more than ten years ago) Cylinder heads were change by a previous owner (and the block obviously) and are not original to the vehicle. Just wondering what i have? Thank you.

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Judging by this and subsequent photos, you have a late '79 block (for and '80 model year), with '68-72 cylinder heads, a 273 4bbl intake, a big block coil bracket, '67-8 2bbl valve covers, and odd combination of alternator bracket, spacers, and hardware, and a '68-up thermostat cover. This should be in the dictionary under "Frankenmotor" :lol: