I will definitely get a copy of that book.
I was just thinking it might be easier to muck around with those blocks as they are screw in rather than drill out holes especially if I'm not sure I am heading in the right direction.
I get that. But your blocks may already be done. Also the low IFR is going to be easier to tune, so if you're going to buy 'em, get them that option.
The main bleeds are in the main body - look and see if they are already screw in type. If not sure, post photos.