What heads do I have?

Factory Iron. Without the part number and/or pictures of the ports it would be hard to tell. Basically you have 273/318 heads with small ports and 340/360 heads with larger ports and valves. Some 318's have 360 heads on them. Some 273's have adjustable rockers and mechanical cams.

According to this you have a late LA 360 roller cam block. So probably 360 heads, possibly 308's which are a good head.

Help Identifying this Block

Looks like someone cut that car for headers at some point and no provisions for heat. It has electronic ignition conversion but I don't see the ECU. Whats the history of this car?