would a ls motor be a direct fit into a 91 civic hatch?? if not what would need to be done????

 

You will need a mount kit: Hasport, HCP, place racing, etc
shift linkage: same places or cut and weld your stock one
90-93 integra intermediate shaft and axles
rear motor mount bracket from a 90-93 integra if the motor does not come with one
b series cable transmission
Pr4 ecu
everything else should hook right up as long as you have an Si model hatch...otherwise some wiring changes will need to be made.