New motor, running issues, may be plugs, Help here..

Ok folks, I built a new motor for my 66, with a 347 with Trick flow 190' 11r heads. the heads call for an NGk fr5, an autolie 3924 is cross refwerence, those 3924's are the one I am using in this motor. I presently am using a Pertronix ignition system with an ignitor III coil 45,000 volts.I am usin a holley 700 cfm street avenger carb with a wiend stealt intake. I need to know what the best spark plug gap for these plugs and this intake combination might be. I presently have them gapped at .35, should it be bigger for this setup still misses under load..

They look very lean, autolite 3924's.. will have to adjust carb some more I think, no soot, not wet, look almost perfectly clean, other than a couple very very small pits In porcilan, (spelling) ...have not run it more than an hour at Idle.