B303 cam with 1.7:1 will yield 0.510 lift and a car that won’t run for crap with speed density
That’s 0.03825 more lift than a stock cam with 1.7’s.
The DS9 is speed Density according to several info sources I’ve looked at. For instance: https://www.stangnet.com/mustang-for...engine.862268/
So unless there’s a DS9 that is MAF, it’s really not going to work with a B cam and 1.7’s or a B cam with 1.6’s. It will run .... like crap.
There are ways to tune it and guys that know how but it’s a very poor starting point if you are set on a B303 cam.
Good luck!
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