318 with 360 heads and compcam build help

You would need to have your 360 heads machined to use that spring. Machine work will cost you more than a new set of springs. You could probably sell what you have here.
Okay so say I sell the comp cam kit and the 360 heads and the 360 block and another 273 motor and a few transmissions I’ve got in my garage now I’ve got some money. And my parts list looks a little different now it’s a 318 with 318 heads a chinesium 4 barrel intake a couple Holley 4 barrels and a 4 barrel edelbrock carb I want some more performance what do you suggest I do to raise the performance?