Valve to piston clearance?

IMO you are concentrating too hard on Scr, and not paying enough attention to Quench and Dcr. Scr is just a means to an end. Cylinder pressure is the target. With tight-Q you can run about 5 psi more than on the loose end of the scale. If your Q runs into the dangerzone, you will have to drop another 5psi. Therefore, you can run;160psi with tight-Q, 155 with loose-Q, and 150 with the Q in the dangerzone. All other things being equal, the absolute power difference, from 150 to 160, ain't all that much. But, the part-throttle difference and fuel efficiency can be remarkable.
Better IMO, to be tight on the Q, and adjust the pressure by other means; principally the ICA or the piston crown shape.
ICa is first chosen by your cam specs, and then adjusted by the installed centerline.
Cheaper pistons, if .010 deeper in the hole, could get you to .079Q, with the .039 gaskets. This is at the bottom of the out-of-danger zone., as to detonation.
But I see an opportunity here; if you can get the decks cut to zero or near zero, with the cash savings,then you get your Q back into the zone.
Your target Dcr is no more than 8/1 @160psi,with tight-Q
10.2Scr will not work with the 262 cam as the cylinder pressure, depending on your altitude, is creeping up over 170psi; you would need an Ica of 66* or a bit more, to bring it down to 160pi depending on the installed centerline. You might be able to hit that with a 268 to 272 cam.
However, if the pistons come without eyebrows, you may spend the savings on putting them in later.

I have had good success with the .039FelPros. I like those gaskets and would strive to use them. That means my pistons could be no deeper than .011. I would do whatever it took to get them at least that high. If I had to cut the decks, then I would target zero. If the 262 Voodoo wouldn't work then for a few bucks more, I would get a custom cam.Or I would reshape the crowns.
If I had to fit into .500 lift for those heads then a custom cam would get me there. If I cut the decks, then there will be more machining required
P/V clearance is checked last.
If the pistons do not have eyebrows, then they will likely need them...... if not today, then for the next cam. You might as well plan ahead. You can cut the eyebrows, one atta time, with the heads mounted, snugged, but not torqued.
If your pistons already have the eyebrows, you may be money ahead, but I can almost guarantee they will be bigger than they need to be for the 262 Voodoo.
Sometimes more is less.
Sometimes a little more money spent on an exact-fit piston, will save you a lotta money on various machinings, therefore actually costing you less.
I think KB performance actually has a teener piston on the books with an .050 Quench-pad on them.I don't see them in my ancient catalog. These will pop up above the deck and you will have to custom fit them. These are the ones I would get. No block machining, no head machining, no intake machining,pre-cut eyebrows, and all the chunks fit together like stock.