Stop in for a cup of coffee

Happy Monday wishes to everyone. I guess the quest to start accumulating 340 parts for the Demon has begun. I picked up a set of J heads last night and am supposed to be getting a 1971 340 block tomorrow. If nothing else, for a while i can mock up an empty 340 with the 6 pack intake and such on it to have next to the car in the shop. Couple questions: if it isn't matching #'s, is there any reason to not go out to 372 or 416ci? Also, what color would the 1971 340 for the Demon be.....corporate blue or orange?