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Ford's FE Iron Heads have a 5/16" hole coming up to and thru the head. Ford would restrict down to 3/16" with the use of steel shim head gaskets also I believe Edelbrock Aluminum heads only have a...

Not sure about the 61 390HP but the 406 and the centeroiler as well as the side oiler 427's had a relief valve at back of block

Tap the hole supplying oil to the stand/shaft (on top of the head). It's about 5/16" and that's tap drill size for a 3/8"-16 tap. Now you can thread in a short 3/8 set screw, you just don't want to...