Re: NEW i am planning on building a bike but NEED some advice
Yes, that's an NT carb, it'll serve you well. Either of those bikes you mention is popular, and they're roughly the same quality
Other things you might have to deal with: bending the coaster brake arm to clear the sprocket bolts, and cutting a notch from the rear fender to clear the chain (just take the fenders off until you get around to that). You'll want a decent chain breaker if you don't already have one, and a set of cone wrenches for the hubs will be useful. Regrease the hubs if you're up to it.