Elgin Industries sells a clone of the Corvette cam at a very reasonable cost. It might be possible to get a custom cam grinder to put clearance ramps for hydraulic lifters onto one of those cams. The basic difference in a solid and a hydraulic cam is a short area of gradual lift intended to gradually take up the clearance before a more rapid rate of lift opens the valve. Hydraulic cams have a very short "clearance" ramp, only .003"-.005", compared to a solid cam's .006"-.015" or so, since the lifter never actually breaks contact with the cam lobe.

I'm considering trying to put sleeves in stovebolt lifter bores, and running MOPAR big block hydraulic lifters instead of OEM items or aftermarket replacements. Custom pushrods would probably be required to do that, but Comp Cams has kits to make pushrods with whatever length and top/bottom shape are desired.

Edit: I just looked at the Clifford cam ad- - - - -OUCH! I hope they include a big jar of Vaseline with that one! No timing and lift specifications, so you'll be buying the proverbial "pig in a poke"!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
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