318 intake manifold advice

My plan is to purchase a F.A.S.T. EZ TB system for a future 408 build, but for now I have a stock 318 2bbl in my Dart, but I can still use the said TB system to improve drivability, and overall enjoyment of the car on a daily basis (not to mention take some of the bite of cost out of the future build by purchasing now), and to familiarize myself with the product and its use.

My question is what is the best solution as far as a 4bbl intake for a 318 (single plane preferably as this is a stock motor)? I'm insisting on a used intake simply b/c my 408 build will most likely require a dual plane so I feel it is a waste to purchase a brand new single plane now to never use again after a year or two goes by. Should I just look for a factory single plane or go after market, if after market are they all pretty much the same considering the intention of my swap? I really want to avoid over spending for this as it will be a short term use and this is not necessarily/solely about performance gain.

Any thoughts or advice is appreciated.