I pegged it as an early Uniflite, but it is a bit unusual. Many of the 27's (which I believe this is) mostly had a hard top aft, with the helm on the aft bulkhead of the trunk cabin. The Mega (a 28) had the flying bridge more forward. I believe that this is called the 27 Sedan Bridge.
These are well built boats, and it should serve you very well!
Wow twin Yanmar diesels--that is going to set you back more than a C Dory!, but should be some boat. Not sure what size you are going with, but I have to assume somewhere in the 180 hp plus to replace the 318's. Yes, they will be about 25 to 30 % more effecient than the 318's..but it will take a lot of fuel to replace the cost of putting the Yanmars--probably new engine stringers, new running gear, including transmissions, shafts, struts and props, as well as cables, harness and guages. I can see just the parts getting in the $50,000 range. I have a friend who did that in a 44 foot boat (replaced 454's)--which his father had built (well known S. Calif. boat builder)--and extened the boat to 48 feet, replacing I/O with inboard Yanmar diesels. Boat Diesel.com is your best resource there.
Inverters--see some comments on the outboards using inverters recently--you have to set up the systems for an inverter (means weight in batteries, which means less effeciency of the boat). Adequate charging systems, cables etc. As far as data--yes, several bring the data to a pannel. I personally like the Magnum--same folks who started Heart Inverters.
Electronics--lots of sources. I like Panbo and The Hull Truth, electronics section. Brands--yes Furuno is what most commercial boats use. RayMarine has recently been purchased by Flir--and that bodes well. But I was talking to the factory reps and they said no structure scan or broad band on the horizon. I happen to like Lowrance: Navico--Simrad etc. They have very advanced technology. Garmin--easiest to use. No broad band sounder, structure scan yet--but its comming. Furuno still has the best quality, but you will pay $$ for the multip function or even the Fish finder.
Go to boat shows or at least marine stores and look at the different units. I personally like lots of screen space, and find it cheaper with separate units: For example I have a 7" radar, two 7" GPS chart plotters, one of which I split the screen and run the fish finder on.
Radar 20 to 24 miles is fine. I have been using Radar for over 30 years hand never owned a unit more than 2 KW, but 4 KW will give slightly better penetration in fog or rain (still limited in rain). The wider the scanner the better the descrimination, but new broad band radar will give very good descrimination with smaller scanners.
Congratulations on a great purchase.
