I bought a used 68 on ebay without muffler for 30.00. I needed a carb for my 61 but for 30 bucks I got the whole engine. I bought a stock OS muffler for a 61 FSR/FX and once I got the needles set for Omega 5% its a one flip starter. Its now my favorite engine. Runs alot smoother and more consistant than the 61 mith a sweet transition.