UPDATE:
Sorry it's been so long since I posted. Jeep ran like a champ for a week then one of the rebuilt heads failed! Shop thinks the guy pulled specs for regular 4.7 heads and not HO. Luckily it stalled as soon as the head failed, so damage was minimal. Rocker arm snapped and took the valve clean off at the stem. Free floating valve just barely nicked the new piston.
Shop took full responsibiltiy and re-re-manned the head, including paying another shop to remove it and re-install it. HOWEVER, they refused to pay for removal or even look at the other head because it hadn't failed - YET!
So anyway when I got it back it wasn't running the same as after my rebuild. RPMs at idle were down and it wanted to stall at lights UNLESS the AC was on to keep idle up a hair. PLUS I just didn't trust the other head, feeling if they spec'd one head wrong - they surely spec'd them both wrong.
Put it up for sale for $7500 and took the first guy's offer of $6500. Told him up-front about the total rebuild but I didn't volunteer that one of the rebuilt heads had to be re-rebuilt. Let him test it to his hearts content before buying it though.
Used $2500 of the $6500 to pay off my rebuild costs and put the other $4000 down on a new Hyundai 4 banger to be my new daily driver. Obviously isn't as fun to drive as a lifted, V8, 4x4 Grand Cherokee, but my gas credit card bill for the first month was $80 lighter than normal.
This is what I found when I towed the thing back home and removed the valve cover: At least proving my low end rebuild was solid and the head was indeed what failed. As you remember cylinder 2 was the one that originally failed, this valve is on cylinder 7.
The new daily driver, after two full tanks of gas is averaging just shy of 40 mpg: