I would suggest you get on one of the LT specility forums like LTXtech.com, or Camaroz28.com, on those forums you'll find the very best LT gurus in the country.
The LT engine is an animal of its own! Therefore, it requires some very specialized performance techniques to make it fly. Not exactly the same as any old SBC engine.
Warren
PS: I'm one of those LTX gurus. I set a N/A MPH record (126.9 PMH) at the 2009 LTX shoot-out with my 1997 LTX Z28 Camaro. Also, my Z28 runs 10.80s N/A. Check-out the Feb 2010 issue of GM High-Tech Performance magazine, my Z28 is in there (Page 053). Also, my link to my RJ profile to see my Z28.