360 & high lift cam

SB Mopars generally have a lot of valve to piston clearance so .600 lift is not uncommon. The only problem I can think of is the retainers hitting the guides if the guides aren't cut down for more clearance. In stock form they usually won't handle over .500 lift before the retainer hits the guide. Sometimes even less than that. I had a set of J heads once that were stock and wouldn't handle over .460 lift.