does anyone know if a 1997 regal engine will fit in a 1998 chevy mailbu? If so what has to be changed out? both are that 3.1 v6. thanks

Mosdt likely it will, but understand - when you switch engines like that, there are brackets, etc. that fit on Buick engines that will not fit on chevies - vice-versa. So what you have to do is take out the old engine and compare it closely with the new engine. Then swap out the iunique parts.