well the impala lt1s came with the iron head lt1s if you got a nice set of heads it would ake a big difference---i would find a set of aluminum lt1 heads off of ebay and have them ported and polished---you should be able to do this for less that $1000 and would probably see up to 40-50hp---as far as the vette tb---i dont know who told you that but it is bullshit......


or just go with nitrous---it is safe and cheap----dont listen to anyone who tells you n20 isnt safe because they prolly never used it before and dont understand how it works.....