68 twin turbo dart project.

Valiant422 said

My understanding was that the only noticeable power gains over a log manifold were with equal length runners, but more power was gained with getting the exhaust out quicker, as not to heat soak everything under the hood.

What liquid do you plan on using to for your intercooler?

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The motor doesnt really care about the headers, but it does care about abrupt tees in the exhaust, like the way a log would be. Air speed is the critical component when dealing with the hot side of the turbo, anything will build boost after a while but if there is a severe restriction the engine wont be able to move enough air to turn a turbo that is loaded by the boost pressure on the compressor wheel. Too small of a down pipe will also create this problem as well as a restrictive log manifold. In my limited experience in turbo charging I found that what works on a naturally aspirated engine will work on a turbo motor. Within reason.

I run ice water in my intercooler system. Some people use antifreeze for its anticorrosion properties. I dont run anything but water in my cars that I run at the drag strip just incase of a leak. Coolant makes a greasy mess that is hard to clean up and if it leaks on a pass it will get on the tires and probably ruin any chances of saving the car. Water seems less slippery when its on the tires.