I would assume a 50/50 mix using distilled water?

And a good ground on the radiator/block to reduce the potential for electrolysis  

Any other suggestions?

Oldmics

Some of the anti Freeze makes are recommended fo aluminum. I'd read the bottle. Also the distilled water is an excellent idea. The metals and salts in tap water are 95% of the avenue electrolisis uses. Soft water is not distilled!

Frank/Rebop

Bristol, In ( by Elkhart)