not sure about a 4 speed but I have used several sets of Summit 1 3/4" headers on b-body's and they have all fit well. I think they are they same as hedmans. I strip them then hit them w/ VHT paint and they are fine. They also have a set of coated headers for around $200+ Another good thing is you can use all of your ex mani studs...not header bolts needed.