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they pulled 225hp only, but that is for a few reasons that can be found here
of course getting more than 225hp out of a 455 wouldn't be difficult
the 1970 models(ram air IV) put out 370 hp and 445 ft-lb's though, but i couldn't find one on ebay. they are my favourite, because of the two huge scoops at the front of the hood. looks so sweet 
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Ya those maybe the best looking cars of all time ( my opinion of course). I had a 72' TA white / blue stripe ( naturally) w/ 455HO. Specs were 300 HP ( the 72 and later HP curse), but dont let that fool you..... I have a 98 cadillac STS now with 300 HP and roughly the same gearing, and My TA felt so much faster.
I guess that feeling can be attributed to the massive torque difference between a 455 and a 279? ( something like that, i forget). Anyway, Im with you, those 70-73 TAs are flat out beautiful