little late on this but to help answer your question what is your goal with the ty? if you want another 9sec ride then yea i would go with the turbo ls1 if its a dd then aint nothing wrong with a 10 sec dd keep the v6 you can easily get 10's out of it. i know you have a quick trans so do you need 2?lol if you want that big of a project you can help with mine!lol