Don't you have E85 in Sweden? If you have high compression, it would probably be ideal with E85 and a supercharger. Just something to think about (eventhough making pistons lighter is a good plan).

Ran

"Hey mister, something's wrong with your car, it idles roughly" - number one comment I got in Israel when daily driving a 70 Barracuda with a lopey cam.

Currently working on - 1966 Dodge A100 van 318/auto
Finally - disc brakes on the front.
In the plans - rear disc brakes, B&M 250 blower