The first thing I noticed when you started this post and looking at the picture was the lack of threads from the adjuster out past the rocker. That is why I went to there instructions to see what the recommended. There was no info on that so it may not be an issue. T&D and some others want 2-3 threads beyond the body to help direct the oil to the push-rod cup to assist cooling. In a drag racing app it may not be as much of an issue. One reason I asked about how old the heads were is because Edelbock heads have a few issues. Tight guides and one of our members noticed that the oiling hole in the head bolt is not drill properly. the hole is drilled but it stops as soon as the bit breaks thru. When I checked a brand new set I had sitting here the hole was opened about 50%. Must be drilled on a CNC and being the hole is angled it should be set to drill about an 1/8 inch deeper.