Will this motor fit into a 91 Civic 3 Door Hatchback or what is the best motor I can put in this car? Thanks.

yes it will fit. and it'll be the easiest swap to do too. pretty much anything else and youll have to
convert your OBD0 to OBDwhatever

Yes it fits but you may want to look into an ls or b20 swap and boost it. If you went with the ls or 20 your could get the turbo too for alomost the same price as the b16 swap and youll have alot more torque

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86 Bronco XLT ~ Blown Tranny&Motor(Ebay'd to Texas)
91 CRX Si ~ Totaled
90 CRX Dx(b16) ~ Jacked
96 LS Teg ~ Traded
91 HB B18a1~Blown Trans FOR SALE
93 Miata MX-5 56000 orig miles SWEET!!!