Dan's 73 Z1 build

I was wondering what all I have to have to put the 1015 cylinder and what I think is a kz1000 head on the bike's z1 900 bottom end, I was going to poke it to 1075 with some Andrews copy cams...I'm looking for a streetable pump gas motor that makes around 100 horsepower give or take 10.

If you want to know how to build a Z1 just go here. Roy

z1oc.com/topic/3496726/2/#new