What is this distributor?

[Detour]

I’m swapping out the manifold so I pulled the distributor yesterday and I’m rather confused. Truck is a 1967 K20 with a 1964 Impala motor. I was expecting an old points ignition, but realized I have something else. The coil is the round canister coil instead of the integrated on HEI. The cap has no wire connectors and there’s only one wire coming from the bottom of the distributor. Inside the distributor, there is no circuit board like an HEI And no points clean.