302 head progress and questions

My first endeavor at porting was done in the basement of the house I was renting in the mid-80’s.
I had no clue as to what I was doing, but was basically trying to copy some pics from a magazine article.
I used a cheap die grinder and an old craftsman 1hp air compressor.
I would think an air grinder running on 30psi or so would still spin faster than a cordless drill, and be easier to control.
I think I had one tree shaped burr, and I had an assortment of stones.
They were 906 heads and I basically just blended bowls where the machining met the as cast port.