Front or rear sump pan?
The front sump clears everything by a wide margin. The truck is 2WD, so the front axle is a straight beam (the 350 didn't get twin I-beam until '67 unlike the 100 and 250). The 90 deg. car oil filter adapter also clears the frame rail, whereas it's going to be close if not actually interfering with the horizontal "truck" adapter.
There has been no evidence of contact between the beam axle and the edge of the sump, and I've been on rough roads carrying heavy loads. Those leaf springs are STIFF.
So I think the "cars have front sump, trucks need rear sump pan" and "cars 90 deg filter adapter, trucks horizontal" doesn't apply here. But I wanted to run this by the group before I bought a new pan (could always use the old one if need be). thanks!
The vertical adapters not only used on the cars but also the 4x4 trucks as well as the F350. Nothing underneath them so plenty of clearance.
C0AE-6881-A - Part originally released in 1960 (C0). The A meaning generic to both cars and trucks.

C5TZ-6881-A - Part originally released in 1965 (C5). The T indicating trucks. But only the 1965/67 F100 and F250 2 wheel drives with the twin I beam suspension (and the 330 M/D in the bigger trucks mostly). With the vertical adapter the filter can hit the large I-beam crossmember, especially if the left engine insulator fails.

C5TZ-6675-E - 1965/66 F100/250 2WD - Rear sump (also drain plug in lower middle to miss I-beam member)
C5TZ-6675-F - 1965 F100/250 4x4, 1966 F250 4x4, 1965/66 F350 - Front sump
C6TZ-6675-B - 1966 F100 4x4 - no indication of sump location. Might be middle sump. Anyone?
I think I'll order a new aftermarket pan rather than delay during the engine swap to clean and reuse the old one!










