It1S10---thank you for all of the input. Like you, I don't think it really makes a darn bit of difference.---Thing is, if I am going to do a new installation from scratch, I would prefer to do what the people marketing the product recomend. The only reason for my doing this at all is that I used the bottom tank off a 6 cylinder Chrysler car, and the radiator builder mentioned that the cooling loop might be marginal, as it was not built for an 8 cylinder car. Personally I think that is a lot of hooey, as I am running a bone stock 305. The external cooler I bought is only a little one, at 4" x 11" x 3/4" thick. I will make a set of stand-offs and mount it about 1" off the inside of the passenger side frame rail, with the 4" vertically aligned and the 11" length parallel to the framerail. There is no fan on this thing, it depends on air flow generated by moving down the road. I very seldom have slow in-town traffic to contend with.