I have a 1965 Chrysler 8 hp. I got it from a friend who was cleaning out his garage. He had it for about 20 yrs and did not start it. Today I fired it up and it ran strong! The only thing was it practically smoked out the entire neighborhood. I want to put this thing on a big sturdy rubber dinghy that I also got from a friend who was cleaning out his garage and take my kids for boat rides, fishing, etc.. I do not want to pollute the lake or smoke out any fellow outdoorsman. Also there are two screws I'm assuming they are the oil / fuel mixture screws, how do I adjust those? Also what is the correct oil / fuel mixture ratio?