Nice pair of trucks you have there Jon! I like flaresides and straight sixes... and I'm with Gary, I have a particular soft spot for the 1981 model year 😁 I will be looking forward to your thread.
SHORT BED 4-DOOR DIESEL: 1986 F350 4x4 under construction-- 7.3 IDIT ZF5+GVOD
STRAIGHT SIX 4X4: 1981 F150 2wd to 4x4-- 300 I6 close ratio diesel T19, hydroboost brakes, Saginaw steering
BIG F: 1995 F-Superduty under construction— converting to 6.9L IDI diesel ZF5+DNE2