if we are talking about the 4th gen accord that came with F18 carby - you need an F20A DOHC engine from the Si Edition - its very torquey, fits bolt to bolt on your chassis and works super excellent even on CNG (if you use the original Honda PT2 ecu) - I did one such swap in Karachi and at that time the engine transmission and ECU cost 65K (I handmade the wiring as I got some up wires only.
If you have the old 3rd gen - (1986-1989 shape) those A series iron block engines cannot die (I have a living proof of that in Karachi)