MadScientistMat said

If your valve cover has three holes, it's a later valve cover at least. I'd check the manifold side of the block; the original motor would have had three freeze plugs; many later ones have five.

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MadScientistMat said

I believe Timken still makes them, and you can buy them through most chain parts stores. NAPA is a good source for hard to find parts, though these bearings may not be all that hard to find. It requires a press to get the bearing races in and out. I'd be very surprised if there aren't any machine shops near you; they're probably listed in the Yellow Pages.

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