Headers are an issue with W2 heads. 1 5/8 are not going to cut it with W2. 1 7/8 is your only option. Buy Headman fenderwell headers. There is wheel room unless your going pro street. Cut the flanges and weld them to a pair of W2 flanges. W2 flange spacers will not work if you attack them to the head and try to bolt on the headers.