Agreed, if you can see the #1's or #6's pushrods (even (1) of em) with an inspection mirror/penlight in the oil filler cap hole in a valve cover, you can have a helper move the crank back & forth a bit (from TDC) with a 1&1/4" socket/breaker bar & if one of the #6 pushrods moves then you are at #1 compression (& vice versa). this'll save you the trouble of opening up a valve cover & having to reseal it & dealing with that mess.