Mark, The "little feet" that you speak of are for a later application as this seal also fits a 2.3 liter OHC 4 cylinder engine. Ford did not use the split lip seal until 1969 and it was made without the "little feet". Ford replaced that 1969 part number with a 1974 number for the 2.3 liter engine and that was the application that uses the "little feet". I have never seen an instruction sheet telling you what to do with the "little feet" but they do need to go. All that you need to do is to trim the feet off of the sides of the seal and a razor blade works very well.
Bos, In regards to filling the hole for the pin, I have never filled it as it is outside the rear main seal and the rear main seal covers the hole from the inside. The rear pan seal covers the hole from the outside. If you end up with a leak there it is most likely another issue and not the pin hole being as the oil would need to get past the rear main seal first. I have never experienced a leak from that area in all of the engines I have done over the years however filling the hole is cheap insurance.
-Fred-