I used to run a stock 360, 2 bbl intake and carb on a stock 318. Got it to run 14.40 so while it isn't optimal, it also isn't that bad. Since the OP only wants to run this for the summer it should be fine.
I did the same on a 318 in a 76 Charger SE.... ran fine on the street, daily driver, work car, etc. never took it to the track but it ran better than with the original 318 intake and carb.
