For my 86' Regal I bought some stainless Ebay headers and I was quite impressed with the fit considering they were about $185 to my door, I had to cut the corner off of the driver's side engine mount and since for now I am using a column shifter I had to modify the linkage to clear the collector but a floor shifter would have no issues.
I have a mini starter and there is enough room to remove it without touching the exhaust and there is plenty of room for an oil filter but I am using a remote set up.
Very nice welds and thick flanges, I also installed these with the engine bolted in but jacked the car up really high.
Here are some pictures during the initial install and a year later the headers still look nice.