[Rory McNeil]

On my 427/428 FE Fords, I use a sealed ball bearing, supposedly the original application was a GM alternator. only issue is an extra .001 or 2 would hold it in better, sometimes it slides out while removing the transmission.
On my SB Fords, I use a factory needle bearing pilot for a 5.0L FOX Mustang, and replace them every year, as they tend to wear.
Many years ago, when I bought my first Jerico, and McLeod "Soft Lok" sintered iron disc clutch, I used a factory bronze bushing, but the iron dust from the disc ate the bronze up really quickly.