I agree, replace all. Why leave any potential weak links.
You will be getting more power now with the msd and if anything is worn out it will leave you on side of the road. In my opinion, the bosh plugs dont do the mustang justice. I tried them once and took em out 10 minutes later.
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5.0, Holley heads, 1.7 Scorp Rockers, Stealth intake, Holley 600 carb, Holley Mech. Fuel pump, MSD 6Digital, MSD distributor, Hotchkis upper/lower rear control arms, FMS B Springs, 3:73 (8.8) rear.
Production # 9,377
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