I looked at KBB and I looked at NADA and I looked in the dealer edition of the NADA book.
You may be right about the 3.73's, but I worry about gas milage with the current state of things. I've read the threads and I get 18-20 mpg with my modified 90 GT wiht 3.73's, but I'm hesitant to 3.73 the 4.6. I'm just not sure about what to expect with a 4.6 and 3.73's with everything almost totally stock. I don't plan on much mod's beyond wheels, tires and lowering. My convertible is my toy, this is my driver.