If you go to a 74 or 75 head, you will get a larger cc head. Also, an early set of 351W heads will have better flow then the 302's, and larger cc chambers. If you could find a set of 69 to 71 351 heads, you would get the best of both worlds, larger chamber and better flow. If you go past 76 on the 302 heads, then you get into some larger chamber but lousy flow heads...... Like Mr. Hurley, I've used Marvel to free up a lot of sticky lifters. The Windsor engines really seem to like the Lucas oil additive once you get the lifters working right. As far as the cam, Summit sells a nice mild street cam with their own brand on it for about $80.00 with lifters.....