If that is a magnum 300hp/360 crate, I think if I remeber right that is a bone stock magnum 360 long block with a carb intake on it. So not much really tamer could you get on the cam.

As said, retard timing to 0 TDC as Ma Mopar did, and lean the crap out of it. It will run absolutly terrible, but if it gets you by, then down the road after inspection you can break out the tools and fix it for the ride home.