I like to use the Speartech harness.. Call John up & he will get the harness custom built for your car with fly by wire throttle!
Motor mounts(i have)
Headers-
Call Art Morrison & find out who makes them for their chassis
EFI fuel tank-
Rick's Gas tanks
Coilpacks-
Stock GM
waterpump-
Stock one that comes with GM LS1 or LS2
Throttle body(where can i find one?)-
comes with LS7
lines
Accessory drive(what STOCK motors could i get the complete from?)
GM LS1
GMPP wiring harness(what does it all come with?)
Speartech
Pedals-
Speartech fly by wire
I would go with the Peterson dry sump oil tank or Turn Key also makes an oil tank for LS7
Attached is a pic of an LS2 track system that we used on an Art Morrrison chassis!