300HP for the base 327ci V8 and 350HP for the optional 327ci V8 for 1968. In 1969 Corvette had the same HP but switched to the 350ci V8 only for the smallblock. The Camaro still had a 327ci in 1969 but it was either a 205 or 210HP 2BBL.
The recommended spark plug gap (I'm assuming that's the 'gap' you were referring to) for a 2005 Dodge Ram Pickup is .044", according to the manufacturer. It's the same gap for all models (1500, 2500, 3500) and all engine sizes (V6, V8, V10).
There are 4 factory possibilities, but if you look under your hood there should be a white sticker with the engine size on it, as in the underside of the hood itself. If it's a V8 then it's either a 4.7 or a 5.9.