Man you must have really ground them down to have that much bad stuff in the motor!
I toasted ONE lobe, shut down the motor immediatly and was surprised to find very little (if any) bad stuff in the motor. I decided to rebuild anyway for other reasons. You made a good call having it torn down. Hyd roller, all though pricey, IS a good call. The split pattern grind will serve you well.
I went with 292 flat tappet myself. Idles at around 1100-1200 (nice and lumpy) and pulls good from 2000. It's streetable, and yet aggressive.