Need help with the 302 heads with EGR.

I got the heads on today and fired it up and right away it sounded like I had no exhaust on the car so I go up and air is just coming out the back of the heads. I think this is where the EGR hooked up at. To they make plugs for these? I am having trouble finding a bolt to put in this not a little hole. IT is some odd ball size
 
Correct. They are threaded on the outside and inside but smaller (obviously) for accessories or tranny dipstick tube holder or........whatever. I believe they come from Ford with Lok tite on the exterior threads too
 
Incidentally they are 14X1.5mm for a quick fix you could pick up some oil pan drain plugs in thisthread/ pitch, or for a really quick and dirty fix the spark plugs for your late model heads should also work nicely :nice:

Dan