'76 400 in a '73 duster

I hope I made the right choice. With it being a .518 lift I know it's getting big. I know it's a hughes cam and they speak highly of it. It idles like a dragster down low but smooths out over 1800 rpm. We have about 45 minutes of run time on it in our engine start stand, and it vibrates the ground. Lol, that seems like a good sign, just hope it will run that well in the car. I called hughes before I bought the cam, lifters, head springs, chain and gears from them. Told them it was a stock 76 400 and wanted a set up my boys could terrorize the strip on the weekends and drive it to school or work on Monday. Weather permitting of course, as we are in oregon. The .518 whiplash was their first choice to recommend, with the ability to run best on engines with less then 9.25:1 compression ratio. They actually say in their description not to let the compression to get up more than that or it will give undesirable performance. Otherwise it's liver rattling tire smoking light to light performance. Haha, I hope.