460 timing

I have a 78 RV based on ford truck chassis with a stock 460 engine-4barrel carb. Anyone know what the initial timing should be set at?

My manuals show initial timing (as measured with the vacuum advance disconnected at the distrubutor) of 16 deg. BTDC.

These is a note that engines made after July 15, 1977 get 10 deg. I suspect this is emissions-related. Using 16 degrees will get you a bit more power and fuel economy so long as it does not ping.

IMO try 16 degrees and back it off a degree or two if you hear any knock or ping.

Thanks!!!