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Personally, I wouldn't fix what isn't broken.
But if you do want to convert this thing over to get better mileage you have many options to choose from.
D15Z1, D16Y5 are the two that come to mind the quickest.. The Y5 will be the more powerful of the two engines but is an OBD2 engine. Thankfully, honda is awesome about their interchangability and you can run OBD1 as well. Which will be more simple to swap with the wiring. The D15B6 is still a neat little engine but with rebuild parts diminishing (rod bearings are discontinued) and only 62hp it just doesn't mount up to the other two guy IMO.
Before you go spending $400 on a single cam engine that more than likely has mileage well into the six digit area (Not to mention if its DPFI its a 1.5liter engine D15B2 that isn't known for its pep or mileage) you may want to explore your other options.
If I had that kind of money to spend I'd look into buying a JDM D15B VTEC engine.. 3 stages of Vtec which can be run with a chipped P72 ECU so that you can get the best of both worlds in power and economy. 130hp and 50+mpg.. Makes me want to sell my setup and go this route.. lol
Whatever you do, definately stick with MPFI and OBD1. It has the most support for tuning and is the most common for the wiring swaps. The intake manifolds are interchangable btw..
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