Do they not make lower radiator hoses with the spring in them anymore? I can't find one for my 82 w/ a 351w. I checked all the parts stores and none have springs in the hoses. They don't seem to have changed the hoses any to keep them from collapsing and I think mine is at high rpm on the highway. My temperature is going up on the highway and down just putting around at low rpm.
The 5/8" nipples on the water pump... Which one goes to the bypass on the t-stat housing and which one goes to the heater core? I've heard the top nipple is for the bypass but I can't hook up the heater hose to the bottom nipple because it's straight and the alternator bracket is in the way, the hose will just kink. The molded bypass hose works there because it's got the bend in it.
You will have to use a longer hose for the heater so that you can allow more bend or get yourself a piece of copper tubing to form that bend. Flare the ends of the copper slightly so that the radiator clamps will hold securely.