I need some help with an old Dodge truck.

Tooljunkie said

My 52 cockshutt 40 has been on 12 volts for 15 years, starter cranks faster. Wont hurt it at all as it has heavier windings to take the high amperage required with 6 volts. My 51 fargo is a different story, i put a new 6 volt starter into it and ran it on 12 volts until i did the v8 swap.

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The other thing about DC motors is that they generate what is called back emf, which simply, reduces current draw, so a 6V motor on 12V doesn't draw necessarily 2X the current The big "problem" (some allege) about high starter voltage is that some will "eat" starter drives a bit faster if they are the "Bendix" type AKA get "thrown in" by rotational force, like early Fords