patronumvs3

i have a d16y8 vtec engine in my 1996 honda civic ex w/ a manual transmission coupe. i wanted to do a b16 engine swap and i was told to not do it with a b16a engine but instead with the b16a2 or a second generation b16 engine. why is this? and what else do i need to buy for this engine swap to work? i understand i need a ecu obd somthing, motor mounts and some other ? can someone help me im a newb. thanks.