Just a quick question,,,,how about building a 230 or 250,it bolts right in.
Or,,, if you are set on a 194 engine,,,go for it,mileage between a 194 & 230 would not be much difference.
Tring to find parts for a really non popular engine like a 194 is probably going to take some research to find pistons.
I am sure they are out there,good luck.
MBHD
