Good advice, Bruce, but Tony make sure you have Anglia spindles, if early Ford spindles the hubs might be set-up for tapered bearings.
Hayden Wheels uses sealed ball bearings because of less rolling resistance, lighter weight, and cost. I have sold ball bearing Hayden wheels to A/F cars and they run up to 230 mph, with no problem.
Another thing is we have used nylock nuts on the spindles for 20 years, because, like Bruce pointed out, the castle nut a lot of times does not line-up with the cotter pin hole with out it being too tight or too loose. The nylock, or locking nut you can adjust it to a perfect position, a little movement back and forth on the spindle.
Cheers, Jon, 805-444-4489, cell