a little updating...
radiator and hoses in place, wiring connected, I finally managed to get it started up and idling smoothly !!
I am very happy and anxious to ride it at last...first thing I noticed is sound is more deeptone than before...
still have to find a way to fit properly some sensors since housing or location on 300 engine is different to 250's so I still have a little modding to do, especially with the speed sensor and the oil pressure sensor...
measured base CR to be quite high...13,55:1
it was not what I originally intended but it is ok, since squish and valve to piston clearances are ample...
next update will be a video of it idling and revving a bit...
(I hate breaking-in periods but I have to be gentle with it while I work on the AFR map...)