After degreasing and hosing, the 30-year-old 350 is still a mess. A rebuilt Q-jet and new Proform distributor overshadow the rest of the engine. Our rehab begins by removing the air cleaner and its exhaust heat riser, then ratcheting out the four valve-cover bolts. A bonk with a dead-blow mallet jars the cover loose. Lift it to freedom. (If your 350 has to pass emissions, be sure to save all of the take-off parts.) Use a scraper and/or chemical warfare to remove all gasket shrapnel from the heads. Years of oil leakage are visible on the intake manifold.