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You have the wiring harness and the ECU, so essentially everything need to make the engine start and run.
Never done this sort of thing myself, but some immediate items that come to mind are:
- Fitting the 300 harness to the 250 frame; ground points, switches, etc.
- Fueling; do the petcocks differ at all? how foes the 300 get gas to the FI versus how the 250 pulls gas into the carbs?
- cooling; do you have the 300 rad? are they even different? will the 250 hoses fit?
- Engine mounting: do the mount holes line up? will you need need to fabricate brackets? does the output shaft line up with the rear sprocket?
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