340 Intake manifold recommendations

I'd run a stock 340 intake before that huge single plane. While don't think an Air Gap would be overkill, unless you plan on upgrading the engine in the future, I'd consider it a waste of money. If you're buying new.....or used, unless you find a DEAL on an Air Gap, I'd just go with an Edelbrock Performer. They're fine intakes and will match your camshaft better, IMO than the Air Gap.