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Trevor and Mike, The trans used will have alot to do with how hot your engine will run. 901s from a 911 are taller geared than those from a 912. The 915 is geared way too tall for a stock type 1 to use 5th. With tall gears the engine runs slower, the fan turns slower reducing the volume of air available to cool the heads and cyl. The problem is the stock engine doesn't have the necessary torque to pull the taller gears at a lower RPM so you overload the engine and cook it. An external oil cooler is not the answer.
If you want a 5 speed and a stock or mild type 1 the best way to go is the 912 transaxle ('66-'68) has about a 4 to 1 final drive in 5th (same as the 912 4 speed but with close ratio gears between 1st and 5th).
If you want to run a more powerfull engine in the future you could go with a 901 from a 911 or the 911/01(used for a couple of years between the 901 and 915) or the 915 and run in 4th gear but without a gear chart for the specific trans you will run (there were many combinations of gearsets available) I can't say what RPM you would have at a specific speed. Clutchs/flywheels play a big part in this conversion, the 901 is the easier way to go. CVs/axles/stub shafts are another expensive concern, some of these transaxles use 930 size CVs and will cost another $500 or more to get the power to the wheels. Again the early 901 is the way to go.
911 fans use less HP than the stock type 1, dyno proven.
I hope this helps some.
ken
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