Ports are fine will support more power than you are making with them.

Chamber looks like hell/valve job is bad at best. (Hard to fix now) they used some POS radius top cut "performance" valve job.

You have poor ring seal and and unhappy valve train.

But with all that said you are still not making power it should as is.

I would say cam/springs are out in left field .

This is what a valve job should look like.