Cams for 318's

I've had a 273 all my life. Evidently you don't know much. Passengers have freaked at how fast my Barracudas were, and I was driving normal for me. They were daily drivers, not trailered, ever. And just for the record, I have an original 68 Fastback Barracuda with a 383 and a 2009 Challenger 6 speed R/T. All three are fast. I also had a 71 Duster 340 4 speed, just in case you think I don't know what is fast... Keep playing the numbers game instead of building and driving something. If you can't make any MOPAR engine fast, and I'm including slant sixes, you don't know what you are doing.
I've dealt with the slant 6's, they are affected by their rpm limitations due to their long stroke and long connecting rods. I'm sure that with a good stall converter and gears you might be able to get some performance from them, but no matter how you look at it they are not known for their rpm capability.