The 58-62+ has 1/2NPT full flow oil ports on the side and a dowel pin that allows you to choose which you want, Bypass oiling or Full Flow. You can read alot about this engine here:

http://devestechnet.com/Home/TheVenerable261

That is a very good engine. Not sure why the parts are mixed and matched other than necessity at some point in time.


Deve

1950 Chevy 3100 Deluxe Cab
1950 Chevy 3100 Standard Cab
In the Stovebolt Gallery
The Think Tank
More info and tips at Deve's Technet