I got close once about 20 years ago with a 276/284 @ .050" cam on a 110LSA using the TRW Super Duty replacement pistons. Those have really small valve reliefs in them. The cam had close to .750" lift and it would "bump" the pistons if I rotated it thru without the head gaskets in place.
I'm betting you have PLENTY of clearance with those parts........
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73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile),
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