Questions about this 360LA combo?

Would it be possible to get a ballpark on my compression ratio based on the following that I have been able to identify off my 360 block and heads. Also are these decent heads to work with if I would consider a cam change down the road. What I would like to end up with is a street car that would be a solid 13sec car if it went to the track. It already runs really good now and honestly may not be far from that number. Here is what I do know. The piston picture I copied from a post on this site. When I stuck a camera in my spark plug hole that’s what my pistons look like. Is that what a stock piston looks like? What is that style commonly called?

1. 4027596 – 360 LA-series small-block, 1.88/160 valves, 66cc-72.5cc

2. Block 4006830-3602 S/N

3. 670 CFM Street Avenger 4150

4. Edelbrock RPM Air Gap

5. 8.25 rear with 3.55 gears

6. 727 trans unknown stall

7. Unknown cam but has slight choppy idle.

Runs off 87 octane with no problem.
Piston.PNG