How to tell if I have an HEI distributor?

[jtinpdx]

Hi All,
First post here, but have been gathering great information from the forum. Love it.

I recently bought a 71 C10 long-bed. I've been doing some projects on it. In researching on this forum about how to get my Temp gauge working, I've come across discussions about HEI distributors.

Dumb question - how do I know if I've got one. It's a 350 with an Edelbrock carb. But what else should I look for determine?

Thanks,
Jeff