I've been using the Mity Mounts in my '67 Firebird for a while now. I have around 435 rwhp N/A and use 150 shot on top of that at the track. Have used them with TKO-600 manual trans, TH-400 and currently a 4L80E. No problems yet. Before that, I used standard rubber mounts with a torque strap. I actually broke the off-shore plain rubber passenger side mount after a few years, how I don't know (aggressive downshifting maybe??).
http://www.mitymounts.com/index.htm
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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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