Spark plug advice

I have a Dodge 360 Magnum, close to stock, but with a Vortech V-1, S-Trim blower blowing through a Carb Shop modified 750 Holley dbl/pmpr mounted on a 170-degree Air gap intake. The engine has step-headers and a decent 2.5" TTI, H-pipe exhaust system.

I have never run it with the blower, and was wondering if someone with experience with THIS combination could recommend a good spark plug to run. A stock-type plug, but several heat ranges colder, is what I've been told, but I have ALSO read that boosted engines don't do well with extended-tip plugs, which my OEM plug is.

Any info will be appreciated!!!

I anticipare 5-8 pounds of boost, BTW... and, it has a Snowperformance BoostColller alky-injector...
Bill, in Conway, AR