Why not go hydraulic?
http://www.superchevy.com/how-to/tra...raulic-clutch/
https://www.speedwaymotors.com/GM-St...SABEgInpPD_BwE
I picked up a pedal assembly from a Jeep awhile back. It looks like it's going to work great for moving pedals from the floor to the firewall.
I know there is alot of kits out there, but I believe it can be done with parts right off the shelf.