It's hard to pull mod $$ out at resale...& forget about your labor.
A lot more power from a TT setup -wouldn't you be lookin at a beefier bottom end at that point?...(it'd beat lookin at toasted bearing bits in yr oil pan...)
How much HP are you willing to put on this stock bottom end? How far north of 400 before we smell smoke?...
Inquiring minds want to know.