Bob,
Still a great story, what a find!
There's more to take care of.
Make sure the brakes work well, especially the brake hoses gum up internally with the years & the brakes won't release any more although the pedal feels fine. Please check also your tires, it's not impossible that those are already 20 years old - too old.
While a fuel pump swap is ok (I assume you are going to switch from the large body style towards the small style with the 250 SE part), the fuel injection pumps cannot be exchanged. Theoretically they could but the 230 SL's engine (M 127 II) has a unique injection pump, which it does not share with any other FI Mercedes passenger car.
Do all the timing, adjusting, linkage tour (very well described by Joe Alexander here on this homepage,
http://index.php?topic=5003).
New points, new filters, new fluids (including differntial & gearbox and all these things are mandatory.
Finally, don't forget the lube job (19 grease nipples) described in the owner's manual.
Check that all the electric components are working well, at least the mandatory ones.
And ah yes, as we are (only) talking about rodents traces, please make sure that no hidden damages have been caused by them.
All rubber & coolant hoses ...
Oh, there's o much more to take care of before you start your engine for the first time in the last 100 years ...
Good luck!
Achim