bbc hyd roller how should it idle? cam info

[veltex]

How should a bbc hyd roller idle? rough, smooth, in between? Its a Howards set up for max torque, intake .519, exhuast .544, lobe center 112+4, duration at .050 intake 212, exhuast 220. This is in a 454, 049s, 8.8 to 1, edelbrock performer stuff on top, Petrnx Hei dist., runs hard all done by 5000, likes 16 initial 42 total all in by 2800, cant get any more than 15 or 16 on vac guage, idle set at 850, in gear to 650, then in gear air on 550. Vibrates truck some at idle, seams to smooth out when reved up, doesnt sound like a lope though more like a semi miss, plugs look good, any thoughts from the wrench genious guys? thanks