I can highly recommend Hesco. AMC contracted Hesco to run their racing program back in the day. Leee (yes three E`s) the owner and Bennie the program manager have forgotten more then most will ever know.
To answer your question, I run the 274/.470 in my stroker with roller rockers. Dyno`s at close to 300hp and 275 lbs/ft of torque.
The major key in keeping the MAP sensor happy (and brakes) is a lobe centerline no less then 113ish. Mine idles at around 14 inches with 113* C/L and a 4* advance. Take a look at the RVOB if you have the gears but better yet give Bennie a call. He will be more then happy to guide you.
Only one whom is (was ?) offering a roller cam is 505. A company I wouldn't buy dog food from. Those whom ran the 505 roller had premature wear as the least of their problems. Stay away from 505.
There has been some talk over on http://www.jeepstrokers.com/forum/index.php
about making up some rollers but not sure what stage the project is in right now. Perhaps getting in touch with SilverXJ over there might be an idea.