I don't think you need to change the oil pump w/o good reason. Oem one is built like a brick and spun smoothly with the jackshaft, so I left it alone.
If you do change pump you can re-use your old Ford p.u. screen (except for one manufacturer). Just be sure to really inspect in the recess under the opening between the plastic shroud and the screen with a pick to get out any bits of guide that may have lodged in there.
Even if you don't want to machine the heads (valve job) and replace the piston rings, you might still want to replace the head gaskets (to forestall blowing one).
Engintech parts (no, I don't work for them) I noticed are 10% off for October @ Rockauto. You can get two head gaskets and two sets of head bolts for a little over $50 (shipped) right now; or the whole gasket set (including exhaust manifold and intake manifold) for a little over $100. My intake manifold gaskets were definitely shot and I've seen youtube videos where these engines make quite a lot of racket if an exhaust manifold shakes loose....