I know a guy from my ham radio hobby, that worked for the Porsche dealer that did the mods. they would receive the snow tracs engine deleted and install brand new 356 porsch engines with dual carbs .he claimed about 90 hp the modds were all done in Australia. I try to pick his brain about as much info as he has still but being in his mid 70's he has a hard time remembering all there was to know about them.