5W-40 for summer, go thinner if your oil pressure at idle seems high (when the engine is warm). iirc, 15-20 psi is about normal.
a thick 30wt for winter. German Castrol Syntec 0W-30 ("GC", Valvoline Maxlife, Mobil 1 0W-40 (shears to a 30wt), M1 5W-30 or 10W-30 HM, 10W-30 HDEO, synthetic SAE30 (usually a 10W-30), etc.
Look for a ACEA A3/B3/B4 rating on the back of the bottle, those oils won't shear as easily as a 30wt PCMO.
Motorcraft filters (short or tall) for a Ford V8 (302, etc) will fit if you're looking for cheap filters.