blazer typhoon clone. LS2 Engine ??

[dukcaln]

so I am thinking about buying a blazer that the current owner put the entire typhoon interior in and the body kit, then transplanted a 05 LS2 Vette motor in it with tranny. removed the transfer case and stuff so it is a 2wd. I have not went to look at it yet but what are some things I should look for when going over the vehicle. claims are 20mpg town and freeway 25mpg with plenty of power!