ORIGINAL: FallDownGoBoom
If my metric conversion is correct, your 3.5 ccm MVVS's work out to about 0.21 cu in, or roughly a pair of .25's.
Yes, it's correct. Well, I think Bronco is the type I'm looking for. If only they had, as they call it, "Laser Pak" of the smaller Bronco. [on their web page, I only found Laser Pak for the bigger one].
Is there any other manufacturer producing laser cut sets/kits for 0.21 engines?