The pan rail drop is 1/8" maximum. It was to allow for the slight interference fit between the block and main caps like a Chevy. That little step makes a slightly longer oil pump drive shaft necessary and possibly some very minor modifications to the oil pan/timing cover interface. If using the BOP one piece oil pan gasket, you might want to talk to them about fitment. In our case, I seal the timing cover with RTV, so no issue at all. The IA II block should fit a stock chassis same as a stock block.
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