If that's the case IMHO the 280/480 cam is really too big for a 318 with compression that low. It'd run but the low end torque wouldn't be very good. Should scream from 3500 up though. If you want decent bottom end torque you should consider one of the Comp XE series or Lunati Voodoo series or better yet a custom grind. They are a little more aggressive grind than the purple cam and have a little more lift for the amount of duration @ .050" so you can get away with running a little more cam without loosing all the bottom end.
BTW: I noticed some guys that posted their clips are running big blocks. Their a whole different animal due to the bigger cubic inches so the 280/480 cam isn't very big for them. Naturally they have good low end torque and run strong.
