What type of fireplace do I have, and what can I put in it?

I'm thinking about installing either an insert or a free standing stove in my fireplace. But I need to figure out what I have first.

The fireplace itself is 37" wide, 30" tall, 26" deep. It is lined with brick, on the bottom, sides and back. The top of it is a steel damper. It has an ash chute in the bottom. It has a Thermo-Rite door on it.

I'm know it is original to the house, which was built in 1968.

I know I will need to install a liner and insulate. I know I may have clearance issues with my mantle. I know I will need to extend the hearth.

House is about 1600 sq/ft, moderately insulated. The fireplace is near the middle of the house, so there should be a pretty good chance of heating most of the place with the stove.

I would like to do a free standing stove, but would consider an insert.

What would you do here? What information am I missing?

Thanks!

Here are a few pictures.

I have no idea if it's a prefab or a masonry. What are some good ways to tell?

I'm not a huge fan of cast or stone stoves. I have a BK King in the shop. I think a Princess would go nice in here.

I'm in Fairbanks, which is right next to North Pole, it's Christmas everyday! Nah, actually they're Halloween/fall decorations. You can just see the bottom of pumpkins on the mantle.

Thanks for the input!

Bob, you're saying that since it was built in 68 it is defiantly a masonry unit. Are there any other ways to tell if it's a prefab or zero clearance (what's the difference between those?)

Thanks