I wish I would have kept the reference but it really surprised me too. The 250 had a one barrel and the 232 had a two barrel so that I could understand them being the same. I'll try and find that reference again but it seems that in 79 the 350 was rated really low.
https://www.autotrader.com/car-news/...-engine-258659
I guess they got as low as 145 in 1975 so I believe what I read is true.
Maybe we will someday cross paths with some heads with smaller combustion chambers to pick up the compression ratio a bit. I'm not complaining though because at the present it is doing just fine.