Finally found the time to work on it a little.
Haven't had any luck finding a 7 blade fan, but that is something I want to try.
I re-installed the Milidon thermostat ( 180 degree ).
I've previously experimented with a 6 blade steel fan ( Jegs ), and a Mopar performance thermostatic 5 blade clutch fan. Didn't really see much difference between the two.
I did notice that the Mopar fan blade was 2 inches or so from the radiator, and the blades were extended out of the shroud more than I think they should be. So I installed a 1 inch spacer to get the fan blade closer. It is 1 inch now from the radiator, and it appears to be about halfway in/out of the shroud. My test, at idle, with newspaper across the grill with the hood closed shows significantly more amount of pull through the grill. So we'll see if that helps.
Someone posted about the radiator to hood seal. Mine does not have one, so it has been ordered. Larry