What motor are you going to swap in? Whatever you decide on, go with a complete front cut to get everything you will need. Add in the cost of an EFi fuel pump and a surge tank, auto electrician etc. Best bet is a ZC from a JDM CRX as a cut or a SOHC VTEC front cut. Both go straight in as long as you have all the parts.

Don't bother trying to change the existing motor to EFi itself - there's no point.