Hi Chukw, I thought I might take up your research challenge.
Let me make sure I understand your criteria:
SB2C-4E:
-4-bladed prop w/ spinner
-Hardpoints for rockets
-APS-4 radar pods (and no Yagi Antennae)
-Tri-color camo scheme
-Pacific combat unit
I looked through my paper references (which are not that extensive) and spent about 1.5 hours searching online (hey, I just recently laid off from my job and time is one thing I have plenty of ;)) and I came up with nothing in the tri-color scheme and found several examples in overall sea blue. I know that doesn't help at all.
One point that might be of interest is that many SB2C-4Es were manufactured as SBW-4E. The SBW-4E was a SB2C-4E manufactured buy the Canadian Car Foundry, (think TBF and TBM, same plane different manufacturers). It might help to do internet searches for SBW-4E as well, although all the images I found were either mislabeled versions or in the overall sea blue paint.
I did find the BuNo of the SB2C-4E and SBW-4E, which might help with IDing photos:
SB2C-4E: 31836 - 31935
SBW-4E: 21646 - 21741
SBW-4E: 60036 - 60209
Aircraft with these BuNo should fit your criteria.
I also tried researching the deployment of the APS-4 radar. As far as I can tell the APS-4 radar was deployed sometime during 1943. I think (it is more of a gut feeling) that the APS-4 radar was initially deployed with fighter squadrons, or more specifically night fighter squadron. I would also guess that the APS-4 radar was deployed on TBFs before SB2Cs. My thinking is why would you need a radar on a dive bomber: 1. It is not going to be used for night operations. 2. What good would an early radar set do on a dive bomber? Dive bomber are going to attack targets on the ground. Would a 1st generation aerial radar system be able to filter out "noise" from the ground to determine a target? I personally think not, and if I was an admiral I would place my radars on fighter and TBFs (for AWACS duty) b/f dive bombers. 3. I really like WWII naval aviation, and have study it quite extensively (for an amateur), and I have not seen any tri-color SB2Cs with an APS-4 radar.
Random facts: 1. SB2C-4 were introduced summer of '44 (but were most numerous of SB2Cs). 2. A directive issued March 22, '44 designated that all carrier-based fighter aircraft be painted overall sea blue. 3. A directive issued Oct. 7, '44 stated that ALL carrier-based aircraft carry the new SEa Blue Scheme.
In summary, I think you might be able to find a SB2C-4E that fits your criteria, but based on my experience it is going to be very hard to photographic evidence. In my opinion you have three choices: 1. Chose a Gloss Sea Blue aircraft you want to make. 2. Make a post-war SB2C-4E aircraft. It won't be painted overall Sea Blue but it also won't be from a wartime Pacific squadron. 3. Make a historically inaccurate plane (after all the effort you have put into this models I don't think you should do it). 4. Rip out the scratch-built SB2C-4E part and build an SB2C-4 or earlier aircraft. It will be hard but you have to decide if you want to do this or make a plane you really don't want.
I know my post is way too long and you probably won't read all of it. I really tried to do some research and i hope that it helps you.
I really have enjoyed this build and it has helped me in building my own models.
KEEP UP THE GREAT WORK!!!!
Mark