Once it warms up outside a bit, I will try the ratchet and u-joint method. It didn't work once on a different engine in the past...maybe I wasn't holding my jaw right during that attempt? Hopefully this old 235 engine stopped in a place that will allow removal of the hidden bolts. If not, I will work my way through some of the other methods mentioned. I suppose GM design engineers never worried about disassembling dead engines. Thanks for the responses.
