[AnthonyG]

Doesn't seem related but when things are hot and at the're most expanded due to heat the torque requirement to turn over will increase. This normally won' cause your slow turn issue unless you have a conductivity issue. You won't notice when cold as everything is at it's most contracted state and will turn easy as you have proven with your torque test, minimal ground will suffice.When hot the old fords always have grounding issues. I know you've cleaned locally but take it all the way back to your basic grounds. First rule you cannot have too many grounds. Check & clean from battery to chassis, same from fire wall to engine. I found a ground on one of my transmission mount hardware. They want a good grounds.