What to do....what to do?

Just talk'n performance, the stock 302 heads be gone for 360 heads. 302's are liked because of their close chamber design and help compression. Being's your 318 is .060 over, compression shouldn't be a concern. You need bigger ports and valves, and the 360 heads (especially 308's) will be a huge improvement, just so the valves and all are in great shape.