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I dealt with several of the two bolt industrial 427's in the late 70's and early 80's and they came with a majority of rods from the 390 variety all the way to the Lemans capscrew style. The pistons varied from flattops with bumpers to a nice dish piston. Most of the dish piston engines had been running on propane or some form of natural gas. Most of these two bolt blocks had the casting bosses for sideoilers but were drilled for center oiling. All had the reinforced main webbing and had the bosses for the cross-bolt mains. All the blocks I salvaged ended up going back together as two bolt main blocks and made excellent stroker material back in those days. Didn't mess with converting them to 4 bolt main blocks as for drag or street use it was not deemed necessary.