Thanks for checking Jay. I ordered the 9/16" bolts last night. On a separate note, last night there wasn't much progress (as I need the correct bolts before I can seal up the timing cover. I took the opportunity to bolt on the cam retainers. I didn't have small enough bolts, so I cut down bolts with the correct threads. (If you look at the pictures posted earlier, the bolts I was using while timing were too long so I put 4 thick washers on to make up the difference. The 4 cam bolt holes go all the way through the cam, so if the bolt is a little too long, you would be able to turn the camshaft. I cut down 4 bolts per cam, put a little red Loctite on each and "snugged" them up. The cam center bolt got a little red Loctite as well and also a thin grade 8 washer.
Also temporarily installed the timing pointer to the front of the timing cover. When I turned the crank over with the degree wheel still attached, the Pointer lined up with TDC on the balancer when the wire pointer lined up with the TDC on the degree wheel. I, for the life of me, don't understand why I couldn't get my head wrapped around that. LOL But luckily enough they line up almost exactly.
While awaiting the correct 9/16 bolts, I think tonight I will take off the checker springs and install the real springs back as well as put on all the remaining rockers (and set the valve lash specified).