I'm building a bb 454 to replace the original sb 350. Anyone have advice on do's and don't's? I have a 1969 convertable z11, 4spd. New F&R springs last summer. Front rakes higher than rear now. New engine will have aluminum heads and intake. Should only be about 70 lbs heavier. Will put in new engine mounts, radiator, heater core. Do want to use bb cowl induction. What else should I be aware of?