I'm not sure about the 40K value in my currency but here is a set-up we did to a friend's 5K and yielded surprising result.
Ported & Polished
4-carb side draft
A worked Cam for daily use, just a step over stock or "stage 1" but gave it a little rocky idle and easy rpm climbs.
Lightened & balanced Flywheel.
Lightened or Aluminum Pulleys
Electronic Dizzy
E-Fan.
We also did something to the valves which I forgot the name to that mod we did, just above the valve seat we machined off a few metals on the valve to make it like a slope instead of the bulging stock configuration.. We saw the mod from a SPOON magazine and we copied it LOLs.