its alot of work swapping from carbed to fi, your goona have to swap over all the fuel lines and probably the gas tank from the si. i think the fuel pump for the carbed models are on the block? alsp the wiring is gonna be a major task all in all its gonna take a long time to swap your si to your dx platform, just save your self the trouble and get another 1300 head or if u have time do the dx to si conversion!