I took my ute to a local exhaust shop to get a custom system fitted. I felt this was the best idea as there is not much room at the sides of the engine. I still will need to fit some heat shields to protect the fuel lines and clutch slave cylinder.
I did heaps of research into the best way to fit the LS1 into my Landcrusier Ute chassis. I went with a Mark's Adaptor allowing me to sue the original gearbox and drive shafts. I DID GET THE GEARBOX OVERHAULED.
The engine and gearbox fits neatly into the chassis.
I did have to modify the position of the alternator and A/C compressor. Once again Mark's Adaptors had all the required brackets. They all fitted without any problems.