I do have a bore scope, but it’s not a flexible variant and you’d only be able to get it into the plug hole with the engine removed from the car due to the location of the frame rails and other crap in these cars.
If you drop the pan you’ll be able to tell what slugs they are(manufacture). Each company uses their own forgings and design, and as such the backside, pin bosses, and pocket are different amongst them. If you drop the pan, rotate the motor so slug #3 or #4 is at bottom dead center, and take a picture or two of that piston I can tell you what they are 
#3+4 are easiest to see in this manner with main webbing placement inside the case