I've been a Goat freak my whole life, and never was a fan of the ones over 1970. I did drive a 72 for 10 yrs, but I couldn't pass it up, 4 speed, 3.55s, all original, (250HP 400) Point is, I always prefered the lemans nose after 1970, over the enderas of the Goats. You did real good with the 455, and wonder what heads are on it? Do you think it's the original eng., ordered for that car? Of course you're gunna get it PHS documented, if it's not already.
And did you mention a "Gear Vendors" tranny in the future? I'm assuming you're talkin stick shift. That will make it extra fun. (Can your wife drive a stick?)
Anyway, it'll be cool to get the head codes off, to see what they are. Good luck with the car.