Emergency: Trying to change oil pump on 65 again

That old 2.5L in my Ranger that died because of the oil pump lasted 228,000 miles. I was disappointed I was hoping it would make it to at least 300,000 without dying. I've heard the realiability of the Slant Sixes to be great too, hopefully I can put everything back on and run it for a few years before it dies. It's going to be a spare car only for fall driving unless I find an underdash A/C but an original one. I keep out on EBAY for them but never win. Hoping I can score one in the salvage yard one day. Then I would be able to drive this Valiant anytime.