I have a 1978 with a 305. Just getting ready to rebuild the engine and was checking the engine number. Found out it is from a 1982 z28 camaro and should have had TBI and run by ECM. Specs call for the 78 to have the timing at 4degrees. But the Z28 should be at 6 degrees following special procedures. What I have is the 305 with a quadrajet, no electronics of any kind, and no emmisions in of any kind. Usually I'd set it using a vacuum guage after the initial setting but the "special procedures" part bothers me. Any suggestions?