Well.... I've been doing some digging when I was supposed to be working, and found some good information. The Oil pump spindle part number is the same for the L16 and the L20b. For anyone that might want it is 15040-21001.
The all they did for the timing chain cover was extend it a bit, which is obvious by how it has the original bolts and an extra set right above it.
If you want the part numbers:
L16 Timing chain cover: 13501-A8600
L20b Timing chain cover: 13501-U6000
I did order a new distributor as mine has been beat up pretty good over it's life, but is the same for all models from what I can tell. Thanks for all the info. If there is something that I'm leaving out, I'd be glad to know.
Thanks!