Ls6
The LS 364/440 would most likely be the econo choice in that the Fuel system would be cheaper, simpler electrical and you get the 440 out of the box. You can save some if you find some Pull outs from a GTO, Vette or F-Body (2001-2002). Would have to update your electrical and fuel systems for the LS6 and LS2 EFI engines, which would add to the cost.
A late model LS2 out of a Z06 would get you the 400 also as with a LS6 with a CAM and some tuning can get you there also.
either way.. .your going to be glad you did any of them....! IMO... the EFI is sweet, that would be my suggestion and choice.





