another 318 hop up question

hmm... 318's don't have a lot of compression but the 68's were decent. For the cam I'd go with an XE262H instead of the 275DEH. The RPM band is more suited for what you're going for and it's good for the gearing you've got too. Add a double roller timing chain while you're in there. Throw on some 901-16 springs too, they're cheap and will work well here. LD4B intake would be the best choice for the 'teener if you can find one. 600CFM is a good size for a 318, vacuum secondaries for an auto trans or mechanical if you've got the right amount of pedals (3). I love 318's :D

As for the 340 or 360... both are good choices. I'm building a 340 and feel like I made the right choice over a 360 but I'm sure plenty of people out there will disagree :P