Hmm.....can you stroke it? If that's a possiblity then stoke it to a 331 (more reliable than a 347) and throw on a good set of heads and intake (maybe some AFRs and GT40 or TFS or Edlebrock intake). You can even get a set of used GT40 cast heads for around $300 if you wanted to go that route. You are still speeddensity but I don't know if it's a roller cam or flat tappet. Either way get a custom cam ground for it and specify what your combo is and what you are wanting to do with the truck. If you want to go that route with the cam I can tell you about an excellent cam place that alot of the GEN 1 guys use for our 351Ws (both flat tappet and roller). You can at least do the heads and the intake without messing with the speeddensity system. When you change the cam is where it gets sensitive. The cam must hold the correct vaccum for the system to work properly. Also what rear end gears do you have? Go to at least 3.73s if not 4.10s.
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1967 Mustang Coupe
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