the engine/trans are supposed to have a 3-4 degree tilt towards the rear. a 3-4 degree tilt towards the front of the engine at the carb pad corrects that and most intakes have that carb angle designed into them. edelbrocks race intakes don't have carb angle. the circle track guys used have angled spacers they would put under carbs to correct angularity. edelbrock probably designs their intakes this way to avoid distribution issues. you have fuel injection so maybe it's not an issue at all. the left to right angle can be corrected by simply moving the engine around on the k-frame mounts; i've done this. the engine/trans isn't designed to sit in the centerline of the chassis. early b-bodies have the engine off to right and a little angled.