Hello Pete.
I'm not really sure about the power gains, with this setup the supercharger is 2,3:1 ratio. So it will give around 5-6 psi i think.
It's a little hardt to know, because it's very little info about the supercharger on internet. It's a Aisin AMR300. It's orginal on a Subaru 660cc that pounds out 65ps or something. but that will for sure break the little bis engine.(?)
And since the orginal Weber can't handle pressure, I'm going to fit a Bosch monopoint unit, with Megasquirt!
I will keep posting pictures.
For the radiator, I was hoping it can be mounted where it is now, for the supercharger is just 1 inch or so beyond the termostat. If it fails to fit, I'm going to buy a slim fan to fit. and then it will fit!
time will show!