Milodon aluminum High Volume Water pump (105.00) is en route as is a Griffin 3" Radiator allegedly good to 600 horsepower.
Jegs and Summit, but both via ebay with free shipping.
During my search I learned that the fox body mustangs are very close in size to ours, being less than an inch and a half narrower. There are lots of really cheap radiators for them, even many with electric fans and aluminum shrouds. I chose not to go that route, but you could buy a radiator for 1/2 what I paid (which was 310.00) and a performance version would still have plenty of capacity.