yeah 600 is fine, 650 max, 750 is way too much. automatic trans doesnt do well with "double pumper" manual secondaries so stay with vacuum secondary carbs. my combo is capable of spanking all factory z28's. its a 1990 5.0 h.o. stock long block with a holley 650, performer rpm intake, hooker 1 5/8 primary long tube headers, 2 chamber 2 1/2 flowmasters. you would do better with a 600 to 625 cfm carb and about 3000 stall converter in the c-4. your gears are fine, but needs to be a posi rear. biggest thing....get into reading mags like car craft...mm&ff....hot rod...mustang monthly....super ford...etc. find a street/strip combination you like and go for it. if you want to be as fast as so&so, build drivetrain your car exactly like his. another thing, make mustang friends. talk to people who like to race their stangs and ask a lot of questions.
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67stang coupe, carb on 5.0, 4 speed, 4.11's....8.41 @ 83mph in 1/8 wanting 7's
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