I have an early 60's (I am guessing) briggs - its either a 2.5 or 3 hp. Crank is 3/4" keyed and tapped for a bolt in the end. I put a new set of points on it and cleaned out the gas tank and carb. It has a down draft carb if that makes any difference to you, and an oil bath air cleaner. Runs great. Spare parts will include a spare block and another carb set up. Let me know if you are interested.