Cheaper and easier to sell yours and buy a fuel injected bike than to retrofit FI. We are talking expensive, complex, time-consuming, and difficult to get right unless, say, the next year model of the SAME bike had FI and you had a "donor" parts bike.
for starters you'd need some sort of mass airflow meter or map sensor, retrofitting an ecm, installing an oxygen sensor in the exhaust manifold, coolant temperature sensor, blah blah blah.
Just get your carbs adjusted and working well and other than choking it on a cold morning, you'll never notice the difference.
See Megasquirt systems at DIYautotune.com. Cheap enough if you use Ebay or junkyard sensors and parts, but you can spend a lot (LOT!) of time trying to build a good tune from scratch. I took my Lotus from carbs to EFI, and the highway tune isn't bad, but the cold start & idle control takes forever to get right.