KR> Engine options?

[patrusso]

I am looking for a narrower (smaller in physical size) engine for my single 
seat KR. My VW is too wide. I want to streamline the firewall forward to look 
more in line with P51, 109 etc. Besides the mazda, what's out there in the 
70-80 HP range that is not 2 cycle? Any thoughts out there?
Pat