Garage Heater Recommendations

[1964FarmFreshC10]

I've been working on my new 64 C10 since i got it a few weeks ago trying to get it ready so i can at least enjoy it with my boys this summer and damn its been COLD in the garage.

For context I live about an hour north of Toronto so as you can image it gets a bit chilly over the winter. I am hoping to do work cleaning and painting the frame and upgrading the suspention next winter so will definitly need some type of heater both to keep me from dying and to let paint dry properly.

Can anyone recommend a good/safe heater for a standard 2 car garage with no insulated doors? I've seen some interestign 120v electric heaters at some car shows recently but they are pricey.