I'm with SFL and Chuckie - Go with the ADA... I have them on my skis and they run great. 35cc domes for sure... though I only run a girdled head on one ski, i have the non-girdled on the other. Both skis have ported motors, but the one with the girdled head has a FPP Type 4 dry pipe on it, while the other is a B-pipe.
Also, dual cooling works great... only thing I have to watch out for is water temp... I'm in the North... so during colder months I need to restirct some water flow... as the lake temp drop into the 40-60 degree temps it makes my motor run cold.