Are you unhappy with the oil you used last time? You might want to bump up to a 15w/40, or, if you feel the need for a heavier weight oil (since you used the STP to increase the viscosity) perhaps a 20W/50. Valvoline makes an oil designed for higher mileage engines, haven't heard anything bad about it...
Oh, and make sure you use a good quality filter such as Motorcraft or Wix (NAPA's filters are made by WIX) and stay away from Fram.
Low zinc oil isn't really as much of a problem with an engine that's well broken in (and at 180K, I'd say that yours is certainly broken in!) but if you want a good oil with some zinc content in it, look to a diesel rated oil such as Delo 400 or Rotella T.
The OHC 2.3 doesn't have the need for zinc that flat-tappet pushrod engines have due to the contact area between the cam and rocker. I run 10w30 in mine, with no issues, and it has a much newer cam (about 15k on it).