I've run 2.02" intakes in 318's for decades with no problem...
If you are going to run 340/360 heads on the 318, it's good to use10.5:1 compression pistons on a street engine to keep your compression up to a level where it is more efficient... 340/360 heads on a stock 318 piston engine will make the compression down near 7.5... 10.5:1 compression pistons on a 318 with 340/360 heads will bring you near 9 1/4 compression...