Search for an engine in market i.e sultan ka khoo in pindi or some place in ISB, should be relatively easy to source, engines have gotten expensive, expect atleast around 130k for the complete job, take a trusted mechanic, do compression test to check health and any other nessacry thing to do before finalizing the deal and be very careful. Haven't done any Honda engine swaps myself but as @Hassan1991 suggested, change ecu for the appropriate motor and wiring as well. Should be an easy job InShaAllah. I would suggest mating a manual gearbox but do as you wish. Hope it helps!