The plate is made for 10.72 or an R engine d/h. If you deck surface machining, square decking or any other mods of the sort, then the plate issue would need to be addressed. If you have a factory block and are assuming it is at correct deck height and just assemble and run, your issues can compound and take its toll on final assembly. Just like paper intake gaskets are put in the kits to allow propper height spacing when the heads are decked. Oblonging intake bolt holes can rob power. I have seen some machine shops deck a block and not cut the end rails down to match.