Building a new 505 With Callies / Mopar Performance Block

I think you should double check everything since the cam button is designed to give the proper clearance with an 0.031 gasket. Do you have the plug installed in the back of the block? Is the oil pump shaft installed? Is the cam button properly assembled? All surfaces clean? Timing cover torqued down? Lots of things stack up in that tolerance but I've never seen on that far off.