I have a 65 Ford F100 with a 300 straight six. I'd like to put a direct draw turbo on it but I don't seem to have any luck in finding one. My next question is it appears to have the high flow exhaust manifold. How efficient is that? It's obviously not headers so how much does that affect flow?

 

Any luck? What is your goal? I know the I6 isn't a high RPM motor, but a turbo would give you a good bump. The manifold you have can move quite a bit of air.

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If it were me I would do a blow through carb from qwick fuel out of bowling Green ky. Best carbs hands down. And a 62ish millimeter t3/t4 hybrid going to an air to air intercooler. You can use a vacuum advance distributor because it will pull timing when in boost if you don't want to add an ignition box. The amount of timing you can get going this route is worth the effort in my opinion.