Spark plug recomendations?

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Looking to see what you guys would run with this combo.

.060 over 350, flat tops 4 valve reliefs, moly rings
882 heads, stock rework
Summit k-1104 cam 224/224 @ .050
Edel performer rpm and 600 cfm 4 barrel
3/4 "shortie" headers and flow exhaust dumped at the axle

The reason I ask is I'm running R43TS's right now, a few of them worked loose and caused me to burn the plug wires up. I tightened them up, got new wires and now it wont start. I think I need new plugs and was going to go up to the R45TS's b/c these are really black and dark colored on the electrode. That means its too rich right? I've always ran a TS plug on the old engine, but it had 305 heads on it? Do the 882's require a different plug??

Thanks
Paul