Sadly,a camera won't really view the bores via the exhaust stack.. the final 90 degree bend will prevent it.. I believe!
Try spying in plug holes with a bright LED torch (or camera) to inspect bores for scoring. (number 4 will be difficult. if the block is still on mid section, use a small mirror). Remove all
plugs and slowly rotate flywheel by hand, whilst spying.
If all rings in all pots are "springy"as you say, all seems to be OK by me and the likely hood of further/any damage is therefore somewhat minimal.
When you are about to conduct compression comparison, make sure of the following:
Replace transfer port covers.
Make sure throttle is wide open, prior cranking.
Crank motor with the ignition in the "off" position. If you don't know how, simply ask me!
Record individual pot readings. 10 - 15% variant is usually acceptable. Remember, all gauges will reveal different readings, it's the variant (no Neil, not Valiant.
) you are looking for!