EFI Bung in head update

Well, pulled the trigger tonight and got the first 2 bung holes (haha) drilled in my /6 head. First one was a trial on what procedure to use, drill and lean, or drill at proper angle from the start. Drilling into cast iron is somewhat a challenge from AL. Slow and heavy pressure, get a good chip clave and keep going. Did the first with a 1/4 drill through the top, then leaned the 3/4 hole saw pilot over to 30 degrees and went to town. I dont know what happened but the hole saw went through at a greater angle and almost drilled parallel to the intake runner ceiling. I changed the angle to about 20 and completed the hole saw. Was a little sloppy so the second was a long 3/16 drill drilled all the way through top and runner ceiling at 20 degrees and followed that with the hole saw. That went off without a hitch, nailed the front side of the valve with the spray pattern. Both are equal but the second one is the best way to do it. Careful on the #4 as the casting is very thin on the back side of the runner as seen in the pic. I used the 4-4-2-4-4 inch measuring method to get them all equally centered in the ports and that will make drilling the fuel rail that much easier. One might wonder why bung the head? So you can hit the valve with the injector spray cone. More for emissions and smooth idle than anything. There is no chance with the bungs in the intake manifold or a very small window if that. Also it will allow you to run any aftermarket intake you want to add a TB to: Clifford, Typhoon, Aussiespeed, Hyper-pak, home grown (mine) etc. My intake is a straight 14" runner ram off a common plenum fed by a Windstar 3.8 TB off a 90 elbow. The TB sits between the plenum and the head and that is where the fuel rail would normally sit so I had to put the injectors in the head. Drilling them left a little step so they seat and Ill have to JB weld them in at both sides as they penetrate the water jacket (water cooled bungs!) so if I am successful in that, it should be good to go. The bungs need to be about 2" long and will be trimmed in the runner after I get them all sized. You can get them pre-made (tall ones) on Ebay for about $4 a piece in a 6 pack. Good deal if you cant make them (17/32 or 13.5mm drill bit into a 1/2 AL tube with a 3/4 OD, and them chamfer the top for the O-ring insertion)