I know I'm an absolute shit about getting this bike going, but I've again made a bunch of life choices that have made it impossible to focus on the bike, BUT I'll getting back to it very soon.
I listed my house for sale, so the last 3 months have seen me working my ass off to get it all ready. The good news is that over the next few weeks, I'll be out of the house while it shows, so I'll try to get stuff finished on the bike.
I just ordered the bit and tap for the head bolts, and it should get here in a few days. Here's the info for posterity:
bolt 68-338: 5/16" x 4 1/8" BSF - bit 6.75mm (17/64") - tap 5/16-22
bolt 68-337: 3/8" x 4 1/8" BSF - bit 8.33mm (21/64") - tap 3/8-20
What we are doing is drilling out the smaller bolts (5/16) and replacing them with 3/8" all around for strength. Then, we can put it all back together and I can relax.
