Take a $70 K chassis, add a $10K small block and end up with a rather plain kit car maybe worth $80K.
Build a some what correct high performance Porsche flat six and the sky is the limit. Bill Freeman sold this car a Barret Jackson for $178K.
If all you want is a Chevy powered car, buy a Z06.
With a 350 HP NA Porsche 6 this little car will scoot.
Add a turbo or two at say 600 HP and the performance will be world class.
I forgot the engine. 3.5 MFI 350 hp Porsche flat six.