We bought our 1980 C37 Yawl (#22) in 1988 and have lived aboard most of that time--both in marinas while still working and while cruising Mexico after retirement. A few of our opinions on outfitting:
I agree with Nifty Nickers about the waterline. We finally painted over the waterline stripe since it was underwater most of the time anyway and was just getting fouled.
Watermaker (nice to have): Spectra 180C below quarter berth (where the batteries used to be). Expensive but very useful for remote area cruising.
Electric windlass (nice to have): Lighthouse 1501 electric. Expensive but we are much more likely to re-anchor for a better set or to move away from other boats with the electric. We had a SL 555 manual before this one.
Windgen (nice to have): KISS mounted on the mizzen above the radar. Reliable with good output when the wind blows.
Solar panels (essential): Four 80W panels. Two on top of hard dodger one each side forward of gate connected to Blue Sky MPPT controller. An essential system for staying out of marinas and not using the engine to charge batteries.
400+AH house bank (essential): midships below settee "L" We have four Group 31 AGM's plus a Group 27 engine starting battery and a combiner.
Autopilot/Windvane (essential): Monitor + tillerpilot is our autopilot and windvane. This setup will work with a wheel as well. Also a Raymarine S100 remote for tweaking the pilot. A below deck pilot would be nice but we haven't needed it.
Radar (essential): Raymarine SL70 mounted on RAM arm above chart table. We're surprised how much we have used radar during nightwatch and fog.
AIS Receiver (essential): Standard Horizon 2100 VHF with AIS and RAM Mic. We wanted a one box AIS system since our chartplotter won't dispaly AIS targets and we didn't want the PC on all the time. The remote mic can display AIS targets in the cockpit.
A few other items we've found useful while cruising: 1500W charger/inverter (short duration use), Honda 1000 generator (long duration use) (Note: it will fit in the large starboard cockpit locker--the 2000 won't), 120A alternator, 12V refrigeration, fans everywhere including the head and cockpit (when sleeping outside in the heat), screens (with no-see-um bonnets), awnings with side curtains, lazy jacks, drifter in a sock with a pole (I'd go with a Code 0 and a furler now).
About davits. I agree the C37 is not ideal for them (Google images does find photos of them). In Mexico we saw most people using them to lift the dingy & outboard at night for security but not on passage. We use the spinaker halyard for the same purpose and let the dinghy lean against the shrouds high enough that someone standing in a panga can't reach the outboard (what they are after mostly). On passage the dinghy fits upsidedown between the inner forestay and the mast.
Hope this is of some use. If you want more details on any of these systems feel free to email us at: firstname.lastname@example.org