[cadillac_al]

For all we know it probably has a Thumper cam in it. It will always be doggy and hard to tune. The "racing" pistons are probably run of the mill flat tops. It sounds like you already have a sound engine with new heads. I'll bet if you put a good moderate cam in it, it will run like it is supposed to. I actually took some aluminum heads off of my truck (350) because I figured the extra power wasn't being used with the light hauling and slow driving that I do. If you live near mountains and haul big trailers then maybe big power is more important to you. Everybody here likes VooDoo cams or Comp Cams 268. I'm sure any of them will really really wake up your engine. If you're set up for roller lifters then there is another option.