As IQ52 mentioned, You have to watch trying to take that unfortunate "lump" tied to the guide boss out because it is there to make room for the counterbore for the headbolts & some space for the oil passage. If You notice the other unfortunate SB trait, Mopar cheaped out on us by not switching to dedicated headbolts
for the 340/360 heads, so there is one tall & one short headbolt between the intake ports on each head. The long ones have the drilled passages in them, but they all
are cast with the same bump in them. Had they used two long bolts, more room in the ceiling could be had, esp. on the ones w/o the passage. And easy on the exhaust
floors, don't touch them other than polishing only, You have to preserve as much SS on them as possible.