273 Overheating problem

It's a 180 thermostat, still has the original 4-blade fan, no thermo. clutch. There is fan shroud, but I'll have to check how much it's actually helping (that is, close enough to the fan to be effective).

I'll have to check my records, but I believe that I had the rad. recored, but I didn't increase the rows at all. I know it will help, but is that a necessity? The load on the engine hasn't increased enough for an increase, has it?

As for the water pump, that is a possibility. I'll have to take a peek inside this week.

Thanks for the suggestions.