1.5 - 1.7 rocker ratio

I'd call the cam mfr that I was considering, and put that question to them. The more rapid lift rates are going to put more contact pressure on the cam and lifters, and the ramps may not quite right for that. Just take the time to be sure for that large a step up in ratio.

It certainly CAN be done; the Ford 351C had 1.73 ratio rockers stock. A piece of cake to get lots'o lift with lower durations.