OK so I put it in. Works great! Now MSD's web site wants to sell me an adapter in order to go with the 5527 as opposed to the 8227. Harness, MSD 6 to Ford TFI - 8874
but I don't find that harness necessary. The connector I have fits in the 5527 just fine. It doesn't take up all of the space of the slot, but the forks line up and connect fine, the clip even clips on there fine. And as you can see by the one they sell it has no clips. So, I'll save the $10 for the price of the connector plus shipping and the $14 in over inflation of asking price of connector, plus the $xx.xx in what they are asking for shipping on top of that.