And lets play the cost game...and we say YOU do YOUR OWN work...here we go

DC Chassis with LS motor = $3000
EG Chassis with z6 = $3000

The car prices will be pretty damn close.

Let's order in a turbo kit for the EG and one for the DC...both stay stock...
EG = roughly 200-220whp
DC = roughly 230-250 whp

And that is playing it safe with both motor. Turbo kit will cost the same for both cars as it is the SAME exact work you will be doing on both.

Let's build the motors a bit shall we?!?!?

B build:
Eagle Rods
CP Pistons
GE Block Guard
Victor X Manifold
70mm Throttle Body

D build
Same as above...cost = SAME SAME SAME lol

LS motor now throws down about 350whp with 1.8L which also means MORE torque
z6 motor now throws down 280-300whp with a 1.6L which means LESS torque

Winner...hmmm let me guess...not the single cam