It's going to be difficult to ride cause of the rake angle. Closer it is to a stock Schwinn cruiser frame the better it'll turn. I've ridden both with the same setup and mine handles worse than the stock frame but imo is a way better cruiser.
7.3 or 4 is way better than a 7.
Since you are a newbie to this stuff I suggest you don't pay somebody to do it who doesn't know how to build 212cc bikes. I suggest you contract someone on this forum who knows wtf they are doing to build it for you. but you won't listen to me anyway, so go ahead and waste your money, when you coulda gone to Las Vegas instead and snorted coke off hookers' asses for a week straight