If you plot lift against crank position/time, you will find the every cam spends waaaay more time below 50% lift than above it. So anything you can do to increase air-flow at low lifts, nets big dividends.
Therefore, your first line of attack is a fast-opening lobe. Which provides other benefits which
@Rat Bastid points out. Running a cam that is one or more sizes bigger, with the same .006 advertized is a very big deal.
The bigger cam will provide more scavenging and the additional overlap will help get the intake charge moving, which, as you know with slantys, the carb can be a really long way upstream.
Yet, the smaller advertized specs, will idle at a higher vacuum, making drive-ability more fun.
I have recently been watching some videos put out by David Vizard, with Unity Motorsports; good stuff. One of the things that he is pretty gung-ho about is his LSA formula. He is adamant that the best LSA for any engine will be spit out by his formula.
It goes like this:
128 less (cubic inches per one cylinder/intake valve diameter x .91) = LSA
For my 2.02 valved 367, this works out to an Lsa of 107.33.
Well that's pretty darn close to the 292/292/108 I once ran, which was gangbusters.
For the slanty with 1.62 valves, this comes to 106.94.
How about you try it, lol, and give us a report.........