340 cam for 318

I'm not trying to be a Debbie downer but IMO a 340 cam in a 318 will just make the 318 "sound good" without heads for high rpm flow it will stop making power at about 5000 rpm or there about. Yes the 318 will sound good and "do a burnout"...:)
and that's the thing. some people just want something that's a little better, sounds good and has some kick to it, maybe do a burn out and that's it. they're never gonna take it to the track. they're never gonna wring its neck bang shifting it at 6K. they're never gonna spend hours and hours running jetting loops and checking plugs looking for that little bit more.

for the vast majority 5k is fine.

also, you're dead wrong. a 340 cam in a 318 will flat *** rip, if done right.