I have a cracked stock exhaust manifold on my 1979 blazer. I am looking to replace it with hopefully an upgrade. I sent an email to Edelbrock, but they said they did not have anything that fit my application. I was thinking of just getting part #6863 K-5 Blazer full-size 83-86 5.0/5.7L w/carb & A.I.R. from Edelbrock. I believe that they say this doesn't fit because there is no emissions exemption for the 1979 year on this part. Does anyone have any suggestions? I will get new stock manifolds if I have to, but my real goal is to convert to dual exhaust with dual catalytic convertors.