Yes that could well be an issue on that specific application, and also you then have the fact that hydraulic cams are noisey and wear faster on solid lifter applications as they dont have the initial ramp to take up the slack, maybe a better example would be an N/A volvo set of cams into a focus ST or whatever.
Or even an xr3i cam into an rs turbo for that matter, im sure something along the same lines will have been done at some point with success in the ford world, but I dont know specifically what.