Hi Jerry...we run into the same thing with the Edelbrock intake....
I'll direct you to some recent images and the pictures will show you the way....
(1) New Intake with NO rear hole
(2) The Dove PCV Plate for a pattern
(3) Drill the two bolt holes and then tap them
(4) In the case of the Edelbrock you bore the hole for the lower breater canister.
(5) The Dove Plate installed with a PCV valve
The Weiand has the material to be drilled and tapped too...
If you need more help...you can call me at work....if you're worried about taking my time up on questions...just call the regular number 402-463-9844.....
What's Big Mike doing on this page....you ought to see what he's building.....I will probably own him some free work for this advertising!!!!
This is his Danny Bee's Dry Belt Drive we're installing....
Have a great day!
George