[Sharps40]

Well, before ya dump a buncha coin, check the obvious cheep stuff first.

Idle/Run mixtures

Timing - static thru 3000 RPM

leak in headgasket/bubbles in radiator/milkey oil

Dwell

Points condition

Mech Advance on dizzy

Vacuum Advance on dizzy

Oil pressure

Thermostat condition

Filth in the block

Hose condition//spongy, collapsing

Belt tension, glaze, etc

Water pump play and condition

Worn out/dirty coolant

Radiator core old/thin, even though not leaking

Radiator cap rating and actual function

Add an over flow tank for another 2 to 3 quarts capacity in the top of the rad w/o it puking it out on the ground all the time

Exhaust manifold heat riser stuck in closed or partly closed position

Restricted exhaust

Dragging brakes

Slipping clutch

Improperly adjusted valves

Gage and sending unit condition and associated wireing resistance.

Then....consider a radiator swap.

But, 210 w/o steam or a popped hose/core in traffic riding the clutch and lugging the motor ain't bad in my book. Perfectly within the no boil range of 50/50 glycol/water a 160 to 180 stat on a hot day with a 12 to 16 lb cap. If it cools back to stat temp when ya start moving and doesn't die or boil over when lugging, you might not have much of a problem