Wow, better be patient on that one, or know someone that knows someone. Data I have indicates there were 36 Competition Green 428CJ Eliminators built. Looks like about 10 have been recorded in the Eliminator Registry. 3 of those are Drag-Pak / 4-speed cars - 2 with black standard interior, 1 with black & white houndstooth interior. But on the plus side, Eliminators are coming out of the woodwork all the time, so you never know when / where another one will turn up!
I don't have specific numbers for non-Eliminator comp green SCJ's, but I would hazard a guess that you are probably looking at single-digit numbers. Maybe a guestimation...
Cougar...by the Numbers shows that 856 Cougars were painted Competition Green in 1970. 720 of those were Standard Hardtops, 291 of which were Eliminators (of the 2,268 produced), giving us 12.8% of Eliminators were comp green. With the remaining 429 being comp green Standard Hardtops (of 49,479 produced), giving us 0.867% of Standard Hardtops were comp green. (*when I say "Standard" I mean the non-XR-7 model, not a manual transmission).
We know there were 145 SCJ Standard Hardtops built, 127 of which were Eliminators, leaving 18 non-Eliminator Standard Hardtop SCJs. 0.867% of 18 gives us roughly 0.156 Standard Hardtop SCJs built in Competition Green. So significantly less than 1 that in all probability there were none built :-(
Concurrently we see that 12.8% times the 127 SCJ Eliminators indicates that roughly 16 could have been painted Competition Green. Maybe.
Unfortunately I don't have SCJ numbers for the standard convertibles, but only 7 SCJ XR-7 convertibles were built. Coupled with the very low numbers of those body styles having been painted Comp Green (27 Standard and 19 XR-7 convertibles in comp green), I think the odds are not favorable there.
XR-7 Hardtops, again I have no SCJ numbers for. But with 309 CJ XR-7's built, we could guestimate some more... if they follow trend with the Standard Hardtop numbers, we know that there were 458 CJ standards with 145 of those being SCJ's = 31.66% SCJ. So 31.66% of 309 would be about 98 cars. There were 90 Comp Green XR-7 Hardtops, out of 18,567 total XR-7's = 0.48% So 0.48% of the 98 SCJ XR-7's indicates that 0.47 of the SCJ XR-7's might have been comp green. So there is a slim possibility that they built 1 SCJ XR-7 hardtop in competition green.
I think I'll summarize and say that the production numbers for Competition Green SCJ Cougars is very small - maybe between 15 and 20. Adding in a 4-speed would drop it to half or less, maybe?
Ok, that was enlightening. Sorry for the ramble. If anyone happens to have any actual statistics to fill in some of the blanks, please share. I would greatly appreciate it.