I use an ultrasonic tester when porting it reveals everything. They are a little pricey, I bought a new GE for about $1500 20 years ago, maybe find a used one for sale.

Making cars faster one at a time!

19 Challenger Scat Pack white
16 Ram Sport SB Regular cab black
14 Charger Pursuit silver
78 Magnum 400 gray
69 SuperBee 512 Passion 4-speed 4:10