You'd have to talk to the dealer and give them your VIN.
Many of the 3VZEs suffer multiple head gasket failures - about half of them, most often the later years of the motor. It's just a bad design. The best you can do (Toyota doesn't do this because of the expense) is to mill both block and heads mirror smooth and install mls (multi-layer steel) gaskets. But for that kind of money, why not swap in a 3.4L and have yourself a real motor?
So how far have you gone with the 3.4 swap?The weight of the motor and trans seem to be the same as I did not adjust the front suspension after the swap and it sits at the same ride height. so I guess its safe to say that the 5.7 all aluminum v8 weighs close to the iron v6. as for room I got a ton more room than my 93 truck. it fits very well. Ill get pics up when I get more free time to button up some loose ends with work and the truck. I had seen an LS1 in a 93 truck in a mag article but cant find it online. it also fit but it looked like it needed some Vaseline and a really big shoehorn to get it in it looked tight.