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Re: Check my combo,please
Need more head info and what kind of intake? If the heads flow enough I think you should run better then 420hp and 12.40s.
Check out this thread and post your info in there. More head and intake info would help though.
http://67-72chevytrucks.com/vboard/s...d.php?t=317628
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83 C10 Stepside (SOLD, it was a blast!)
383 MASS-FLO EFI/TKO II 600/3.90 Posi 10 bolt
S475 and C4 DM running, fine tuning
turbo= 
Douchebag Racing: Runs Fine all the Time
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