I had problems with Jeff. Long story short I asked Jeff to port my 426-SR heads. He said send -em, said 2 week turn around time. Several months later I learned they were collecting dust there while he was doing heads that came in long after mine had I threatened to show up on his doorstep and talk to him hand to hand and he finally worked on my heads. The work that was done was first rate but he just did a bowl blend and not a porting job.
Life is to short to put up with crap like that. I'd been fine if he'd turned down the job.