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- 15:52, 14 July 2020 (diff | hist) N Correct Tune up specs to be used (Created page with "I have a 1970 F250 with a 390 engine. It has a distributor and control module from a 77 6.6 . A 4 bbl holley and performer intake. Do I use 1970 tune up specs or 1977?") (top)