Hello, Emmanuel:
You may recall I built a rather similar 427 for CF-21. I used the 428 SCJ crank, the Chevy bearing & pin sizes in Jahns pistons at about 9.5:1 compression. I chose a Crane solid (but mild for auto trans) cam. I, too, have the Edelbrock heads but elected to go with 406 Tri-Power carbs.(The look is cooly excellent.)
This is a slow project thus far, but I expect dyno numbers very close to yours.
Thank you very much for sorting out ring/pinion and coil spring specs. I shall plagerize. Did you convert the rear suspension trailing arm to Cobra (i.e., adjustable) type? Which pin-drive conversion did you use for Halibrand mag wheels?
Best Regards,
Rheinubung