1952 Chevy with Small Block overheating

[OrrieG]

If timing is suspect use a vacuum gauge to set the timing, maximum vaccum is where the engine is running most efficiently. I did not know if it would work on FI engines and found this:

"Connection of the gauge is made to a simple "manifold" vacuum source. "This must NOT be from a ported vacuum source (a source that pulls vacuum from above the throttle blades) which rises as RPM increases." In most cases, your manifold vacuum source will be a direct manifold fitting, or in some cases you can use the PCV port (larger port on the carb) on a typical carbureted application.

NOTE: Connection to EFI (fuel injected) applications is best done "Tee'd" into the source line. If you are not careful, disconnecting a particular line can affect the idle speed and interrupt information that the ECM needs to see. For this reason it is best to tee into your vacuum source for the gauge connection."

I use a timing light to get it close, then check with a vacuum gauge, usually taking it to max vaccum then retarding just a little bit.

I also think dwscr's suggestion is where you should start, get all the stuff off the radiator and see it runs cooler, at least to eliminate that as a variable.