A valve job is far more important than the grinding you are doing. I’m not trying to discourage your porting, but not doing a quality valve job is the worst decision you can make. All porting starts with the valve job.
Alright so prior guy did 1.88/1.60 valves but didn’t cut them down into 3 or 5 angles, just stock cut but bigger than factory 1.78/1.50. You’d do a 3 angle on it still? Just want to make sure I’m following.