I had my 1958 235 rebuilt by a custom rebuilder (now dead). It ran well before rebuild. It runs well now with 2or3 hours on it EXCEPT after driving it will overheat if left to idle. I measured the coolant at 207. The block is clean inside (rebuild). On startuo the copper headgasket failed mixing water and oil. I had the head checked
(Flat/cracks/magnaflux/clean) new fiber/metal gasket---another new 180 thermostat-tested both and they opened right at 180. replaced water pump with short shaft from Patricks. New Desert cooler. HELP! Any Ideas.
