Here is a few measurements that I took. The photos show these measurements.
Seal Shaft Journal = 2.622 in / 66.60 mm
Block Groove Depth = 0.285in / 7.25 mm
Cap Groove Depth = 0.218 in / 5.55 mm
Seal Groove Bore = 3.19 in / 81mm
Seal Groove Width in Bore = .185 in / 4.7mm
Seal Groove Width at Opening = 0.236 in / 6 mm
Here is the seals that I researched to fit. The Victor JV 745 has an unknown ID as the tech rep at Victor said they did not have that data on 2 piece seals. I do not think the Chrysler 318 seals will work.
JV 745 OD=3.237 ID=(?) Width = 0.308 This is specified for this tractor and also fits the
1954-1972 Ford 272 & 292 engines.
JV 606 OD=3.30 ID= 2.64 Width = 0.340 This fits a 1975-1984 Chrysler 318 cu in
BS 3141 or (BS 6141-3) OD = 3.22 ID =2.595 Width = 0.220 This is specified for this tractor and
also fits the 1954-1972
Ford 272 & 292 engines.
BS 40245 OD = 3.307 ID= 2.64 Width = 0.320 This fits a 1975-1984 Chrysler 318 cu in