Block tubing, got some questions.

You probably really don’t want to talk about this now but how deep are you. What I’m thinking is if yard straight past say two lifters, stop there. There is no rule saying you have to drill 10 inches from each side. If you have to drill deeper in the front so be it. Personally I wouldn’t have the block on a wooden palet and then stand on the wooden palet. I want it sitting square on a concrete floor. Goodluck buddy and I hope all goes well.
Actually I think that is supposed to be reamed, not drilled.
I have always done this with a 5/8 reamer and drilled the oil feeds.
A reamer usually follows the original hole quite accurately. Drilling not necessarily. Imho