Difference between 318 ARP head bolt options

Yeah, that makes sense. If I remember correctly, the W-2 and the Edelbrock heads require two extra long bolts and the first one has four long bolts so that would be for the W-2.

I can't remember exactly if the late W2's take two longer head studs instead of one, but the early EW2 stuff takes one long and one short.

I never order studs (or bolts) with the short studs. I buy the kit with the long studs and make up spacers.