I'm still looking for the article. I think I have it somewhere. I found these notes. It's a cut and paste from someone that had it done.
Here's the finished product awaiting the installation of the seal. I'm planning to slide the seal on the crankshaft prior to placing the crank in the block. The rear main cap will then be fitted over the seal and torqued in place. First step is thoroughly washing the block again to assure no metal shavings are hiding in oil passages. The seal part number for this application is CR38649 if using a Chicago Rawhide seal. CR is now part of SKF Bearing Company. My supplier crossed referenced to a #N0046762001 which is about $15 less expensive. The Speedi Sleeve (Shaft Eze) part number is 99386. If you plan to do this modification, check the diameter of the crank flange closely before ordering the sleeve kit. There are two sleeves that are very close in diameter and either may work for your crankshaft. Speedi-Sleeve pdf catalog can be found on line.
Here is the blog that this came from. Almost all the way down the page.
http://41chevystreetrod.blogspot.com/
