Well I successfully fit a new engine in my 1968 Sears SS12 Hydro, although its not exactly a 68 anymore because of the engine swap and then the needing to swap out front grill and hood with a 69 I had so that I could accommodate the air cleaner, Id say the swap went pretty good. The hardest part for me was cutting into this old survivor but I was running out of Tecumseh parts, fining many parts were no longer available. I need this tractor for mowing and snow blowing so plan to use it many more years so sprung for a new engine.
The reason I used the 69 grill is because I had to cut it away to fit the engine and did not want to cut the 68 grill up, plus the 69 fit perfect for this engine I think by taking both sides of the grill off it now has a pretty cool look, but all in all I don't care to much because after all its all about blowing snow for this tractor.
No cutting needed to this side of the grill can fit my pinky in between the exhaust and the grill.
I could not think of a better place for the exhaust to exit. With the hood shout you can't get burned by this one.
Sorry Tecumseh but it was not practical for me to hold on to your well built steed of an engine, now lets see if the Subaru will have the life it needs to wear out this Sears hydro rear end...lol