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do you have a chevy HEI? I have one that is about .75 longer than normal. I think it is a olds or pontiac. It would have the gap you describe if installed on chevy. Measure your HEI from intake flange to lower end of unit. If it is chevy, then your oil pump drive shaft needs clocked to allow the tang on bottom of HEI to engage. (this misalignment should only hold HEI out about 1/4")
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