before I took the engine apart I made my new headers to fit and route the way I wanted using my R-77 Yoshi first 10cm, then stock ZX-12R header tubes (had them handy and useless), then again 2 to 1 part from Yoshi, then the rest will be custom made after I put the engine in its place... a pic from when I was matching it...
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after that I started dealing with the modifications I had in mind to do...
the lineup
1. TBs "porting"
2. piston and pins' lightening and balancing
3. rod polishing and balancing
4. head work
5. oil pump axle, water pump, starting gear, stator/rotor and 250's side covers to fit
6. 300 fuel pump to fit in 250's tank (along with its base as proven obligatory on the way)
of those only the last is yet to complete and has proven a PITA so far but can be done with some patience and a lot of work...mostly because 250 Fi tank has 5 bolt holes while 300's has 6...luckily the 300's base is wider and flat so a new drill design will do the job...