Not sure if you are working on a budget: here is some information to get you started, and a lot of what I am listing is more budget type parts. You will probably get 500 different types of answers from various lsx swaps.
harness and ecm tune:
http://chevythunder.com/
Accessories: F-body or Corvette will clear. LQ9 accessories work, but some require notching hood due to alternator.
Motor mounts and headers: dougs mounts and headers, hooker mounts and headers, brp has a nice set of brackets and headers.
Are you going to swap to the LS1,LS6 intake?
Oil pan: modify an F-body pan and p/u, or buy a swap pan and p/u.
If using the LS1 intake:
Fuel Line Fittings:$101.63 http://www.summitracing.com/parts/AER-FCN0615/Fuel line$0 http://www.summitracing.com/parts/RUS-640853/ Fitting$0 http://www.summitracing.com/parts/FRA-209006-BL/Fitting$0 http://www.summitracing.com/parts/FRA-200106-BL/Fitting$0 http://www.summitracing.com/parts/FRA-483206-BL/Fitting$0
Fuel tank: if you are not going to mini tub-spectra tank. Otherwise Ricks, rock valley tanks.
Fuel filter regulator from a C5 vette:
Lokar throttle cable and pedal or modify 6 cylinder 69 camaro pedal.
Trans mount: what type of trans? brp, ats, street and performance....quite a few to choose from.
Powersteering: have a local shop build your lines depending on what pwr steering set-up you go with.
Good links:
http://www.blown.net/cars/camaro68/ls1swap/index.html
http://www.ls1tech.com/forums/conver...e-threads.html
http://ls1tech.com/forums/conversion...ro-basics.html