1979 dodge mobile traveler 360cl wont pass emissions

In defense,I loved my 21 ft '77 class C w/ a 360. Just out of warranty, put a Holley 4 barrel, hooker headers, and a distributor advance curve kit, and it was one of the best running RVs I ever had, and would pull 10 MPG anytime I kept my foot out of it. And pulling 6% donner Pass w/ my 19 ft I/O to Tahoe, would still get 8-9 MPG on the round trip. Wish I still had it,.........so there !!