Civic SiR-S

Hi I have a Civic and im thinking on going the TURBO way

but, I want to know if its a considerable difference between a d16z6 block and a d15b7 block, i will use the Z6 head, but is a very noticeble difference in power between the 1.5 and 1.6 ??

please help me, because the 1.5 is the engine of my civic, the 1.6 is another engine that i have but its not register on my civic and i cant, because its from my broder civic and it has to be TOTALED and REGISTERED AS TRASH so i can register the engine on my civic, an my bro. civic its runing but with an H22.

Please you people how know about D-series Turbo, please help me on this, if its a very very much difference i will go 1.6 but i want to know

thanks
hope you can help me