For sure, gear driven, NO chains is the only way to go. Here's some shot of when I was changing out the tired 318 for a 71 340!! First picture is when I was pulling out the 318 @ -25 OUTSIDE!!! in Fairbanks AK back in the late 90's. The second & third pictures are during the install in a warm shop on base. You will notice on the driver side inner fender a trickle charger and 4 way plug inside the Tupperware. They were used as the truck was my daily driver even @ -50!! Sadly the truck is long gone. But it was a GREAT project.
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