b16aman

i have a 1990 honda crx hf with a d16a6 in it right now its junk. i want to get a b16a or a b18c in swap in it. which one would be the easyest to put in i no i have to have hasport mounts and need to put a dent in the frame rail for alternator clearence. my one friend has a 1994 honda civic with the b18c in it he wants a $1000 for the whole car its was hit by a pickup on the right side where the shrut tower is which is now worthless the guy ran right up over the corner of it. i was also wondering what dose the b16a 1st gen come with obd0 or 1? thanks mike