Well, I finally have the budget to build a new motor for my 87 1/2 4x4. It's only a little each month, but I have a fairly good idea of the parts I want to use. I am going to use Dart SHP heads with an Isky nn257/265 cam and long tubes. I am trying to decide if going TPI will choke the motor at the upper RPM levels. Peak horsepower is at 5000 RPM with this setup, and I have heard that the TPI manifold isn't much good after about 4900 RPM. I have had the truck for 10 years, and have hit 4900 + RPM less than 5 times (I drive like the old man I am) however I really want torque to tow a trailer with. I have towed upwards of 6000 pounds with the stock motor on this truck, but it struggles. So, my question is; Should I stick with TBI, or is TPI worth the extra effort? I know this will start a firestorm of opinions, but lettr rip guys. I have talked about this before, but now I have the money for parts (the bottom end is my christmas present to me).
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