I think a while ago, i found one of them lines up with the pushrod for the fuel pump.. Probably the top one you said has a bolt in it.
I was trying to change a fuel pump in a '57 nomad and was VERY tough to get your hands in there, one hand holding the pushrod up while you get the fuel pump in there and a bolt started...
I got an extra long bolt and threaded it into one of those holes in the front of the block, so it would hold the fuel pump pushrod up... Then i wouldn't have to worry about holding that pushrod up while i get the fuel pump in there. i could bolt on the fuel pump, and lastly remove that long bolt, and put the short one back in... I think it'll probably leak oil if you leave that bolt out, maybe not. /forums/images/graemlins/dunno.gif just make sure its not long enough to interfere with that pushrod.