Does this sound right? Is it possible?
"Depending on what intake & throttle body you use would rate 565-585hp on engine dyno and 525-540rwhp (pump gas) higher HP options available with camshaft & valve spring change will add $450.00."
Here is the link for the parts
http://schwankeshortblocks.com/Short...rt%20Block.htm
Its long block upgrade #2.
If its even close, thats amazing for $6300, or even add the $450 for more hp.

