Just completed a rebuild of my 65 389Tri. New Butler Performance parts with Ross forged to spec pistons. Went through the standard 200 mile back road accel / decel, cahnged oil and filter, then another 100 miles for a total of 300 now. Did some freeway test for acceleration and was impressed. My question is for those who have traveled this road, when is it safe to let it all out and see what she can do?