First of all, those heads aren’t trick, unless you are running Super Stock, and no way would I have used them. Stud mounted rockers are JUNK. You won’t find many even basic SBC’s out there running stud mounted rockers any more.
Second, all that work on the crankshaft is overrated. He could have reduced the diameter of the counter weights and used a crank scraper and been better off.
Third, you can tube the lifter gallery with a hand drill if you have the common sense of a stick. It’s not hard. And it’s not trick. It should be done on ANY engine with solid lifters and any engine with hydraulic lifters where you want to control oil leaks.
Fourth, using chevy rods is a no brainer. Bearings are cheaper, easier to get and have many more undersized available.
That’s a basic prepped short block, with 10.5:1 for the rules and a solid lifter cam. The heads damn sure ain’t trick flows and most likely aren’t as good as a set of chinese heads with good porting.
Again, it’s not that hard. Nothing trick.