Erson Cam >> good with lots of compression ?
Lift has everything to do with valve to piston clearance. Valve timing can make it worse. If what you said were true, the op could put a 750 lift cam in his 273 without modification. There is physically not enough clearance without modifications..
Be careful with absolute statements with P-V clearance....if the ramp speeds changes, the answer is going to change. Actually a .750" lift could be done with adequate P-V clearance here .... the mid-lift ramps would be far steeper than anything we use and probably could not be run over 1 RPM LOL. But it
would have adequate P-V clearance if the ramps were slow up to 40-50-60 degrees after intake closing or before exhaust closing and then got really, really steep.
So peak lift is at best a vague indicator for P-V clearance... that was the point. If you used cams with all the same ramps, then you can make better estimates/guesses, but once the ramps start changing, the "OK or not-OK vs. peak lift" answer changes completely.
A 286 cam with old style, slow ramps
might be OK here, but a 286 like a VooDoo or a grind optimized for a .904 lifter would probably be in trouble. Being a solid grind makes this more potentially troublesome. With the older 273 2V flat tops, the pocket depths are pretty shallow (maybe .100" or thereabouts) and those pistons came up almost to zero deck... IF those were the pistons the OP used before. I would assume the hi-comp pistons' valve pockets are deeper. But that has a lot of assumptions being made so is really only a guess. Sorry I can't do better, OP.
BTW, OP, you cam number does not show in the present Erson catalog. PN E420306 shows up as being a very similar MFT cam. Is yours a re-grind?