I've got a 350/350 drive train and did the EZ-Wire kit, like steppinwood pointed out.
I also added a stereo system, air-conditioning ... and this Spring I'll be puttin power seats in ... the EZ-Wire kit gives me plenty of extra circuits to add anything I please!
It was FUN to install and only cost $165.00
Go for it, man ... and if you have any questions, email me.