Long rod RB build questions

[PsyOps]

I dug out set of custom Ross pistons in response to a 'Wanted' thread here and I believe he passed on them, but it got me to thinking, why did I get these in the first place? They are pop top slugs with a 4.28 bore but a compression height of only 1.732. Wrist pin hole uses a stock big block rod (1.094). There was no info sheet with them when I acquired them many years ago and well before stroker kits appeared on the scene. Best I can come up with is I was going to fit them into a 426W block using a stock stroke RB crank and a 7.1 rod which, according to my calculations, would leave them .018 in the hole. I do have a 413 AAQA block sitting around and was thinking it could go .080 over but I haven't had it checked. My best guess is these were for something like NSS or other class racing where a 426W was required or the engine size to car weight ratio favored using a 426 vs a 440. I called Ross but they said the Job # was no longer in their records. So, can anyone think of a different way to use these? Maybe even in a .030 over 383? Ideas/thoughts? Here's a pic:

 

[33 IMP]

Looks like a 383 block, 383 stock rod, 440 crank combo, but in the hole a little bit, twenty thou or so..
But then, if the block hasn't been decked , you could cut it to where you want.
If that isn't a hollow dome piston, could you mill off the dome? (With that bump, pump premium looks impossible to me, maybe 12+ to one?)

I'd love to know what those weigh.

 

[RemCharger]

Should be a # on them.

 

[PsyOps]

On the underneath face there is 'ROSS' and '425R' under the Ross. On the bottom of the pin hole base the 5 digit job number is hand etched.

The pop up appears to be solid as there are machined valve reliefs and a spark plug notch that are cut down to and below the piston face. I believe the pop top could be milled if desired. I'm sure somebody had these custom made to race with.

The pistons are +/- 690 g.

 

[PsyOps]

Looks like a 383 block, 383 stock rod, 440 crank combo, but in the hole a little bit, twenty thou or so..
But then, if the block hasn't been decked , you could cut it to where you want.
If that isn't a hollow dome piston, could you mill off the dome? (With that bump, pump premium looks impossible to me, maybe 12+ to one?)

I'd love to know what those weigh.

Thanks for your insight. A 383 with a RB crank makes perfect sense as that was what we were doing pre-440Source, et al.