turbocosses

frist off i drive turbo ford mostly merkur, point is i don't know honda well. this dude is selling a 91 civic si with what he said is a 94 del sol block and head 1.6 vtech. i know of the mimi-me(head swap)but does this engine bolt to a 91 tran and fit in a 91 civic body? NEXT how do you know when the vtech kick in ? the car was quick in hit like 75-80 at 4700rpm during the test drive in third and she still had pull the owner she it kicks in at 5500rpm but a was driving on a busy street. any reply will help he selling soon and cheap. thank