if you do get the Leo make sure its the SF version with the 7.5mm carb, the last person i recomended the engine to got the standard version which is slightly cheaper and then moaned it wasn't that good
i still love the old irvine 36's and i wish they still did them, fantastic carbs and long life, i just can't buy an engine in that stupid colour.
talking of which, the West 35 would tick all the right boxes