You definitely should've gotten a LS1.....thing would have 500HP by now.
Did you pull the heads and mill them for increased compression on your V6......I don't know how much you can....but the compression is pretty low on the V6s....like 9.5?
By /TC do you mean torque converter? If so what stall did you get? Does the V6 have the same auto trans? 4l60e?
With a cam and converter, you'll definitely have to tune it now.