Looking at Comp 282S, installed 4 degrees advanced, 65 cc chambers, Felpro 1020 head gasket, .010 in the hole, you'd need an 18-20cc dish to get compression in check with those heads. That gets you between 10:1 - 10.25:1, and on either side of 8:1 dynamic compression ratio
If you considered the 270S, same setup, you'd need 22-24cc dished pistons. That gets you between 9.6:1 and 9.8:1, same DCR numbers.... or you could install it on a 110 degree centerline and use the same compression as the 282S
With the gears you have, I think the motor will be much happier with the 282S and a 750 or bigger Holley. I actually chose a 270 for my 445FE but its going in a 4000 lb pickup with 32 inch tall tires and 3.50 gears. Yours is lighter, more gear, less tire, so let it breathe
As far as the heads, if you can find a piston, nothing wrong with those heads at all. You will need to run Cobrajet headers though, not 390GT headers.
If you can't find a piston, go with a larger chamber early head, the performance will be the same, you just need to use a different piston to get to the compression you want.
One last bit of advice though, if you haven't measured the chambers, measure them before you decide. Ford iron castings are all over the map in side, some small after being cut a few times, but most run big.