Need a few suggestions....Plugs? Oil? Trans Fluid?

Champion used to be good plugs. Not now. Offshore manufacturing. I have had a couple failures recently. So unless they are free or very old stock i wont screw em in.

im my opinion, atf is far superior to hydraulic fluid. It was my understanding type f was developed for the clutch lining ford used in the 60’s and 70’s maybe 80’s
And i dont understand why it would make such a difference with current clutch materials.
Type f is still available, so it still has some purpose.
Type F was Ford's first ATF that was used in the early Ford-o-matics dating back to the early 50's.

All Mopar and GM products spec'd Type A fluid which was superseded by Type B then Dexron in the 70's.

If you used a Type A/ B/Dexron in a Ford transmission the clutches would burn out innjust a few miles without the Type F friction modifier. Happened to me twice when a local shop serviced my '79 T- Bird and '75 F150 transmissions ( FMX).