68-383 and $2500.00 where to spend it?

Here`s one for you guys. I have a factory 68-383 from carb to pan and a budget of $2500.00 to spend on it.It will be going back in the original car it came out of, a 68 Barracuda. It`s only in need of rings ,bearings,and the standard machine shop work, but I`d like to do a little something to bump up the hp. I was thinking of having the heads worked a little and the valvetrain upgraded since this seems to be where there are some shortcomings. I will probably reuse the stock manifolds intake and exhaust,so the car will appear entirely stock.So here`s my budget, what would you do?You may go as radical or factory as you want as long as you stay within the $2500.00 budget.Thanks