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I'd go LS and have enough for bolt-ons, good brakes, etc. Normally I can find a b18a1 swap for about 850, add 300 for mounts, and you have pleanty to get cams, etc.
From what I've heard there are some IM clearance issues for B20s in pre-92 Civics.
There are clearance issues for all b-series engines. It doesn't clear the stock hood. You have to go aftermarket or get the jdm zc hood or do the jdm front end conversion.