A lot of those numbers are mostly the same mini-starter. The MC-Robb (not on the list) is probably the actual best, and costliest, but be forewarned you may need to grind the block to use it. I know, your thinkin, why would I buy the most expensive, especially if I have to grind the block??? Reason is, the whole thing can spin on the mount bracket to put the solonoid in any position, and give really good clearance from the headers. Some of the Powermasters work well with headers too.
