In my mind a motor with 3.31 stroke is more "rev willing" (dont know the word for that but I hope you get what I mean) than a 3.58 or 4. All I'm saying is if your looking to do a performance build on a 318 your better off with the 360 as parts are plentiful and you'll get way more bang for your buck. What heads are you planning on using?
My plan is to use KB167 +0.060, 318/340 crank 3.31, ported 974 heads w 2.02, 1.60 and milled to 60cc valves Lunati Woodo 268/276 cam, offenhauser 360 w Holly 600. Am I on track with such set up or off side what do you say?