Ron, Something to consider.....I'm running a six blade flex-o-lite #FLX-1615P (Simmit Racing $24.95) style fan on my 235 with the adaptor plate and the old style pump. It required some careful tweaking to open up the center hole to 7/8" but it pulls air great.....temp runs a notch below the centerline on the stock 54 gauge with a 180 thermostat. This is with the "Old Aire" A/C cranking!!! I did add a pusher in front just in case, on a manual switch and dual relays but haven't even needed it so far.
I have about 1/2 to 3/4" clearance between the center mount blades and the stock mount radiator and have no other clearance issues with the H/B or the alternator/belts/hoses. The only down side is that you will have to pull the radiator to remove the fan, but I don't see any need in the near future. For a complete waterpump change, the adaptor plate, pump and fan come out as a unit without pulling the radiator. The trade-off in HP is worth the peace of mind knowing it is working properly and not subject to any little glitches or Gremlins!!!
Dave
