Sean,
I disagree.....you have a real LS6, a documented LS6.....most real deal LS6 Chevelles have either the original engine and or original trans long gone. As they were well abused and or raced. If you wish to build a nice fun Chevelle to your liking, with a fun engine and with a 5 or 6 speed trans.....build one out of a 6 cylinder or a 307 Chevelle.
Plus, to me it is refreshing to see a real deal LS6.....as most are clones today.
We all love these Muscle Cars....the real cars will always be the real cars, I say keep them real and accurate as they were born. Nothing wrong with telling the world as you have done so....that your real deal LS6 does not have it's original drivetrain, Integrity
Just my two cents.
Dan