My '46 Chief has been converted to A-75, but still no electrical system. I can't offer any helpful tips except to say,"I like the power on climb out".
Mine has plenty of compression. It is about all the compression I want pull through when propping, especially when it doesn't start right up. Depending on your age and physical stamina, I think the C-85 will surely need the electric starter. I wish mine had it.
Have fun!!