Some things that would be required (Some previously mentioned.) all assuming you already have FI:
Different fuel lines from the firewall to the servo.
Different fuel line from the servo to the fuel distributor/spider (?).
New mixture & throttle cables and brackets. VANs sells brackets that I would recommend. They seem pricey at first look, but are well worth it, especially the nicely engineered mixture assembly. (It is VAN's THROTTLE/MIX KIT
Part Number = IO-360 THROTTLE/MIX
Price = $95.00)
Appropriate exhaust for your plane and sump combination.
FYI - I used the A.E.R O. Aviation (800-362-3044) sump on my ECI Titan engine and it worked out great. It came with the induction manifolds, O rings and gaskets. One note, though, you might have an experimental engine as a result of the change, unless you go with Lycoming parts. However, these parts may be able to be used on a certificated engine and the engine still remain certificated. I don't know. You might also look at ECI's new sump, which is different and supposed to be lighter. I have seen pictures of it on their site, eci2fly.com , but haven't seen one in person. They are all supposed to fit the Lycoming 360, since their Titan engine is a 360 clone. They even advise you to use the Lycoming OH manuals, etc.
Good luck