LT's will reduce your backpressure with the blower, and you will lose a little bit of boost and hence power. But with a more free flowing exhaust, you gain, so you will gain some power, but lose a little.
Cams with a blower are overkill on a blower IMO, its far cheaper to simply spend $60 for a smaller pulley and belt and have just as much power as a set of cams that would cost you well over $1,500 for the cams installed and tuned.
That being said, i always wanted the FRPP Hot Rods cause i love the idle. So if you go for cams, go for the sound not the power cause $ to power wise, its not worth it by a long shot.
2007 Mustang GT Convertible Stage 0 E-Force #402 Supercharger, Brenspeed Tune (435/400), GT500 Fuel pump, Clutch Delete Option, Roush Front Fascia, Brembos, California Dream Hood, Qwitch latch flush mount hood pins, MRT Light Bar, J&M LCA's, BMR UCA, UPR catch can, 6000k, Pypes Bombs, Pypes X-pipe, Airbrushed Flame pieces under the hood, Clear corners, GT500 shocks , FRPP P-springs (rear), BMR Adj Panhard, E-Force engine covers
2012 Ford Focus SEL 5Dr with MyFordTouch, Auto-Park, 303A Package,