Post #38 is spot on.
This is a photo from one of his small block distributor ads marketed under the HIREV7500 brand. Do a search for this part number (DST3890). I could be wrong, but it seems like he takes an offshore repro unit, and just installs a metal thrust collar with a couple shims and his generic "performance curve." - something anyone can easily do. His ads are also very carefully worded - "100% Chrysler engineered internals," "original '70s Chrysler 'Indianapolis plant' bulletproof design." Nice salesmanship, but count me out.