@Bobby,Ron + all

thanks for all your input. Helps to narrow to find the goal!
I listened to some additional files on youtube and soundwise
it might go towards a 110LSA, here's an example i like:
http://www.youtube.com/watch?v=yKaf3QiUI6k
by the numbers:
http://rides.moparmusclemagazine.com/ride/1192716/supergoatsack/1977/honda/civic/index.html

it's a solid ... and i'm going for a hydraulic. Not sure if they are different in idle-sound.

How much will the torque-curve change comparing a 108 to 110 LSA ?

I also would be interested in knowing what differences to expect in torque and hp-curve compared a 112LSA with 4 advanced vs.a 108LSA