I believe all 1967 - 68 428s were 4-bolt main. It's probably got a 1968 cast date, but was manufactured for the 1969 model year.
I have a complete 1969 428 2-bolt short block assembly that was running when removed. After dismantling, I coated the bores and lifter galley with white lithium grease and wrapped it in plastic wrap to protect it from rust. I had it sold for $900, but shipping costs killed the deal. If it is nearby, take that into consideration on pricing. Shipping anything now days is pretty expensive.
Mike
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