just speak to a local engineer mate and see what he wants you to do to get it passed. but all in all the marks gear is bloody great, makes the job quick and easy even if a little pricey for some of the stuff.
There is a GU ute in the members section. Pretty sure he used the dellow kit. But done alot of work him self. And used an auto aswell. There is plenty of GU's with LS1's and LS2 just gotta track them down and ask them. Pretty sure they will answer any questions.