3.8 head swap

[bigbrownbird]

I have decided to keep the 3.8 in my 90 t-bird ... for a little longer. I bought a set of supercoupe heads for a song, nothing wrong with em, the guy just had a LOT of supercoupe engines from the intake down. i heard that you can swap these on a standard 3.8 and pick up about 20 horse ... is this true? what, if any mods are needed to do this swap?

Lee Overman