I keep on changing my mind if I should build a blower or N/A motor for my 79 cole tr2. I had a mild blower motor in it last labor day and the boat went 118 in Blythe with minimal set up. I like the big inch motors they make alot of power or what about a hi rpm 470. The boat used to run comp flat from what I was told. I will use it mostly for the lower part of the river and a little track time.