Vehicle weight is a very small part of lag. Distance from the exhaust port to the turbo and the size of the compressor are what matter the most. Stall speed on the converter will have to carefully match the turbo spool-up rpm for a good launch.

 

Welds look good to me i couldnt have done that good any ways what kinda hp will u be able to make on pump gas ? I saw where parish made like 1011 hp 1090 tq crazy on pump gas 26 lbs boost off turbo.