Winter coming, need advice for this newbie...

Greeting 440 A-Body folks. I`m in MA and with winter coming I have a question. Since I don`t have a climate controlled space for my `71 Duster w/ low comp 440 Torqueflite I`d like to keep the car running (not on the road but enough to keep the motor going and the tires moving). Brad Penn 10w40 green oil in it now. Should I switch to a light oil for winter and if so what grade? How often to start it up? Other ideas? Help! Thanks in advance. BTW any Mopar people in Eastern MA/ RI area please feel free to friend me on this forum.