Unhook both small wires from the coil. Measure ohms from one coil terminal to the other. Anything over 3.5 ohms (a guess by me, maybe 3.0 ohms) probably has a built in ballast resistor.
What part numbers and manufacturer name are on the coil?
By the way, does your starter have support to bypass the ballast resistor for easier starts?
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12
'52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
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