Points Distributor - What's This???

Thanks guys. I've never seen a vac advance relay like this before. I'm assuming I can just ditch it and replace it with a normal vacuum advance pot with no ill effects? I was thinking of using this distributor to get my 400 running. I'd just need a ballast resistor and coil.

Alternatively, I've got a MP electronic distributor and extra HEI module I may wire up instead. I just need a coil for that one.