push rod hole
#3
push rod
#4
Place the head on the block and try the pushrod with the rocker installed. If it interferes or is close take the head off and drill out the pushrod holes. Went through a number of drill bits doing this to an E head for a 66 45 degree block.
#5
I don't think they will. I have used Gen2 with 45 degree blocks and 3/8. I moved the holes towards the deck about .110 (one hundred and ten thousandths). Call a reputable shop that knows the difference between the 39 and 45 blocks and have them do it
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