It'll be a 12 volt. I converted it over 30 years ago and it worked well. I ran the 6 volt starter on 12 volts and never had a problem. On this new motor I'll probably go with a DUI electronic ignition if it'll work. I have one in my jeep and am sold on the performance and simplicity. I intend to build the motor to 54' vette spec. I haven't researched it much yet though.
NM