JJR is correct. That is the GM Goodwrench Crate engine. I just put one in my 72 LWB in January. It has a 2 piece rear seal and the dip stick can be mounted on either side, it comes with a 2 plugs of different diameters to plug off whichever side you don't use. You can go to Scoggin-Dickey's webside (sdpd2000.com) and get a spec sheet on the engine.
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'72 LWB Stepside
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