the heads have been off of your motor at one point or another. those sharpy lines on the head bolts are to help degree the bolts. with that cam, i wouldnt be able to keep myself from pulling 1 head to see what's going on inside.
old mod list: H/C/I/N/E/G 408
new mod list: 5.3, gears/posi, mufler and tune : (