Welcome to the forum, aomiles!
I see the person's legs in the one photo, near the engine, and using that to judge the size of the engine, I'd say it wasn't large enough to be a Wright R-3350-57. Plus there were 4 huge props on a B-29's engine.
It looks to be a Pratt Whitney R-1830 instead, which had 3 props on each engine. I also notice that those props are in remarkable condition, which is telling me that they weren't under power when the aircraft went into the jungle.
As for the number 205097, I'm not having any luck with that, perhaps one of the other guys might be able to scare up some info on that.
* Wait! I'm wrong...I just looked closer at the images, and there are 4 props...just by looking at thier position on the hub confirms that.
I didn't see the first engine pic, it was slow to load. The photo offers a much better perspective about thier size, so those must be Wright R-3350 engines *