I pretty sure corvette LT1 heads aren't any better than the heads you got right now. LS1 corvette heads are way better, but they won't fit the LT1 series motors. I would just go off with the AFR or trick flow, that way you don't waste your time finding (vette) heads that flow the same, and you don't waste your money, You could use LT4 heads with LT4 hotcam which is a good package. But you have to use an LT4 intake, because the LT4 heads have higher intake ports. I just would use AFR's or Trick flow LT1's with LT4 hot cam and that way you can use your factory intake, which is good over 425hp. probably one of the cheapest bank for the buck! plus AFR heads are the best in the market, most of their heads out lowed brodix heads