How much HP are you hoping to gain at the crank,?
Did the guy that built the heads give you an aprox idea of what can be expected? Are you doing anything else, like cam?
Heads alone are good for 15 to 20 HP, if you do the cam you MIGHT get a gain of 40 to 60HP. I used to really be into the HP game, but it's been over 35 yrs for me, so my BP/ Brain Power, isn't quite what it once was.
I'm in the process of looking for a 1960s Chevelle, Camero, Nova or Mopar. I want it to be turn key and totally reliable, with AC, so something with an LS swap is at the top of my list.
I'm not gonna rush into this, as it will be something I keep until the day I die.
If you remember flag me when you post up the final results of your upgrade please. I'm curious to see the gains you make.
Good luck, have fun, but most of all drive it like you stole it!!!
Dan.