Picking the right tunnel ram (+doing mods if necessary) along with proper carb choice + tuning is critical.
You miss any of these and blah. I feel this is why TR's have a certain bad rap - you know, the 'bolt it on and go' syndrome that praises / craps on many hp parts.
Ptu them in the hands of a great tuner that can correctly spec parts - like a handful of people/builders here - and you can really make some majic.
Just don't listen to the guy with an 86 Trans Am with a stock motor and a tunnel ram sticking out of the hood saying they are junk. Sorry - had to say that. Seen way to many of these this way. LOL.