Older post, but took your advice. Didn’t go with low gear, and swapped out the brake for a non brake valve body( swapped and it paid for the labor) as the guy who did the trans wanted the brake and had a spare non brake valve body sitting around.
Now that the car is making more steam, I am pretty sure a low gear would have grenaded my new center section by now, even off the foot..
After finding the balancer issue, maybe the lazy 60 will fix itself with the timing having been retarded 5 degrees.
We will soon see.