I just completed installing a new intake manifold, I'm now re-installing my distributor on my chevy small block. I dropped my distributor back in (aligning it to the #1 cylinder), but my distributor stops short of dropping to the bottom by about 1/2 inch. How or what do I need to do get the bottom flush? I have not yet installed the distributor mounting plate with the one bold, not sure if that will make up the difference? I have not turned the engine over in any way during the install of parts.