Go oem? Or any other brand recommendations?
87 cougar 5.0
Aftermarket is ok, but get new aftermarket. Cost is usually so close that for 5-10 bucks I'd rather just get the new one.
Get a Ford Racing stock replacement water pump. It's just a new Motorcraft pump in a FRPP box. It's cheaper than buying a new Motorcraft pump too. Hell they just slap a FRPP sticker over the Motorcraft one on the box.
http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=3223
I had one of the Ford Racing pumps on the 306 that I just sold out of my Coupe and it was a great pump. Summit has them pretty cheap but you may be able to hunt around and find one for the same price with free shipping.
http://www.summitracing.com/parts/FMS-M-8501-C50/
Darren