Really appreciate the Dynatech link. The 3/4" to 7/8" step design in ceramic coating would work well for me, and the price isn't too crazy. The ones listed in racingjunk look like they would stick out from the head too far for the Nova.
I am slowly getting my build finalized in my head. Right now I just have a used Dart Little M block (4.125" bore w/ 350 mains) and 6" Oliver rods. My plan is to bore it to 4.155" (the bores are acceptable, but might as well start out fresh), buy a 3.875" crank, buy a set of Trickflow 18° heads that I am currently looking at, and then spec out some pumpgas / nitrous friendly pistons plus a solid roller cam grind. My desktop dyno program estimates mid to upper 600s FWHP, depending on how much duration I pick for the cam. This will be a nice upgrade from my current 406, which probably is at 500 fwhp or slightly less.