What cam are you running?

I have a Delta, they did a cam to my specs.
.236/.230 duration, 106 LSA, installed ICL at 100 degrees (6 deg advanced). .340/.322 lobe lift.

Don't forget the slant has a long stroke and crappy ports so you can get away with a bigger (duration) cam than other motors.

And the rocker ratio does suck - on mine it is 1.436 I played with pushrod length and found that the factory length actually produced the most lift (.488 at 0 lash) even though geometrically they are too short depending on who you believe.

However mine has yet to run (still sitting on the stand with the car in the body shop) so its kind of theoretical...