Hi I'm new to the forum and the Y-block been around engines and such since I was in high school I'm 35 know and wrench on diesels now.  My question is the pulley or damper is it interchangable on the 54 239 with later year Y-blocks.  Reason being is I'm adding a Wurth it rack and pinion with power steering to my 54 Customline and I'm not sure if it will work but I have a later year Y-block that I have set a side to be rebuilt which I could take and use with the pulley that comes with the kit if it is interchangable....Thanks Ellis

Welcome to the site.

All the Y damper/pulley assemblies are technically interchangeable.  Crankshaft snout and front seal diameters are the same for all years of Y production.  Things to watch out for would be different timing pointers and clearance to the front engine mount if that’s being used.  Belt pulley allignment also needs to be checked.

Lorena, Texas (South of Waco)

Thank you this is what I was looking for. Know I know I can press on and give it a shot.