I have an 87 3.8 N/A fwd Olds 98 Regency. I know it's not a TR but at least it's a buick engine! Well last week the timing chain gave up and I'm replacing it. I need to know where to set the timing marks on the timing gears? The 8th digit on the V.I.N. is a 3. I needed that when I purchased the parts for it. Any help would be GREATLY APPRECIATED!!!!!!!!!!!!!!!!!!!!