Assault distributor won’t fit my 1966 273

OK, it isn’t the O-ring’s fault. The Assault distributor is actually a little longer, and the tip is different.

I compared it to a big block mopar distributor, and it definitely isn’t that. Did they send me a Ford or Chevy distributor?

I’ve read on this site that many people have used the Assault for small block Mopar, so I’m confused