Hi Cody,
Can't fully answer your first question, though I do see PS1 engines in general at York, but I can answer your second inquiry. Replacing an original MTH white battery with a BCR is quite simple as all the electronics are in the tender. Just remove the tender shell--usually only four screws from underneath near the corners, locate the battery--it's physically like a 9V battery--remove it, unplug it and replace it with a BCR1, which also looks like a 9V--plugging it in and sliding it into the battery holder in the tender. Believe me, if I can do it, you can.
Go for it.
Chris