I've run 150 shot on my n/a 435 rwhp 67 convertible at the track for years with no issues to the body. I've broken 2 rear axles, a TKO manual trans and ripped the perches off a Moser 9" but have never hurt the body. Doors still close like a new car. I have welded subframe connectors and CalTracs, but no roll bar or cage. The Pontiac ragtops are much tougher than you would expect. By comparison, my 88 Mustang GT was a flexing POS with just a stock 5.0 and slicks. I'll eventually get a 5 or 6 point bar of some kind.
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1967 Firebird ragtop, 464, Weiand 8-71, ported 6H heads, Hyd roller, 4L80E, paddle shifter, Moser 9", Cal-Tracs, Vintage Air, Corbeau seats, 13"/12" disk brakes, Hydraboost, electric cutouts and M&H drag radials. 
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