Slant six identification experts: How about this?

bschief: I checked and couldn't find any numbers under the alternator bracket. I did find some markings molded into the block under the fuel pump. The first was an arrow pointing to the numbers 1 - 2 - 3 , and the arrow was pointed at the number 2. To the rear of this was what looked like a clock symbol, with an arrow in it pointing to the four o'clock position. Any ideas?