Uh oh, power steering bolt broke into number one cylinder?

Measured a 340, 360 and 3 318's. from the block face inwards to the cylinder the 318's averaged 654 thou. the 360 was 647 thou and the 340 was 623 thou. Add the front cover and gasket thickness to this (458 thou) and that bolt better have an under head length of less than 1.1 inch. Not allowing for washers or P/S bracket.
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