I ran the 068 (Melling clone) when I first got my car with it's original 400 and #48 heads. Very nice. Then I swapped to the Crane H272-2 which was similar in size @ 216/228 at .050. That was nice too. I did a chassis dyno with that cam and the numbers were 285 hp and 357 tq. The best one was the last one I put in it, a Comp Hyd roller @ 220/224 at .050. That cam made the 400 seem a lot bigger and got it down the 1/4 mile at 13.20 @ 105.5 on some years old hard BFG Radial T/A's....I believe the 60ft was something like 2.10 or so.
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frittering and wasting the hours in an off hand way....
1969 GTO, 455ci, 230/236 Pontiac Dude's "Butcher Special" Comp hyd roller cam with Crower HIPPO solid roller lifters, Q-jet, Edelbrock P4B-QJ, Doug's headers, ported 6X-8 (97cc) heads, TKO600, 3.73 geared Eaton Tru-Trac 8.5", hydroboost, rear disc brakes......and my greatest mechanical feat....a new heater core. 
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