I really need sum1 2 help me as im newish to hondas,

Ok so i just picked up a MINT as 1993 ZX teg (yeh i kno gay as DUAL CARB 1600 SOHC) but it was really cheep so i thort wat the hell..

Any way, i need to kno how hard it would be to fit a XSi B16a or mabey anotha 1600 vtec from a civic or sumthing into it. Being as its the conversion from SOHC carb to DOHC EFi i was jst wondering wat needs to be done and how hard/expensive would it be?

PLEASE SOMEONE HELP!!