I am watching a crankshaft on ebay that ends in an hour,it says it is for a 97-04 mustang 4.6 six bolt main, it says that this part is not compatible with my 97 f150 4.6 romeo,is this correct? I thought the blocks were all the same except for the six bolt verses eight bolt crank,can anyone verify this,I need to know within the hour before the auction ends,thanks