[Ross F-1]

I would not buy a Speedway radiator, check out Champion. Many cheap aluminum radiators have epoxied tubes, totally unrepairable.

220 on the heads seems awful high to me. I took these readings with an IR gun on a 95° day, after a hard uphill climb in traffic, 160° thermostats. 4-row brass radiator.
Location.................... temp
Top tank ....................173-179
DS head (center).............183
PS head (center)..............183
DS thermostat housing .....173
PS thermostat housing.......179

I think your radiator cap should be a 4 psi?