I've been having flashbacks to 140 land- I've been working on Volvos since 1981......The strombergs are not as bad as people think. Float levels need to be right, and most issues with general running revolve around slipped needles or jets, or a ruptured diaphragm. I am confident the diaphragms are still available from Volvo Canada, and probably can be ordered in the states- our last stromberg car was 1984, so thats not too old in Volvo speak.
My favorite definition of a Borg Warner 35 automatic trans- "A device designed and built in Britain to transform torque into a stream of oil on the ground." Start the search for the M41 trans. You'll want it. Has to be 71 or older with the swan neck shifter unless you want to do some tunnel remanufacture.
If its too cold out, pull the crankcase breather hose off the can on the side of the engine and let it breath free. They freeze up and push all the oil out past the felt crank seals.
Find a distributor and ignition module from a 75- electronic ignition=good.
The clunking noise you hear will be a bad rear trans mount. Don't worry too much about it.
If the roads are snowy enough, you will begin to question why all cars don't run 165-15 tires. Enjoy the drive. It'll make the trip with flying colors.