273 Rocker on 340

Yes, I have done this before on a 360 years back. My question is, I've heard you can 't go to much lift using them. Anyone know how much is too much? Would I be safe with this cam as an example.
Howards Cams 710461-10 Howards Cams Hydraulic Flat Tappet Camshafts | Summit Racing
Nice cam specs, I ran something like that in my 11.3/1 alloy-headed 367, and I absolutely loved it. I was very sad when it dropped lobes.