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Which IO-540?

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Skybolt-can

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I'm moving along steadily with my skyobolt project and at a point now to decide on the engine.
I have a 540 mount and want to use a 540.
The question is which model.
The options are -K 300hp. Lots of power but is the extra 70# worth it. The -D give 40 HP less but weighs 70# less. And the -C and -D are easier to find and cost a lot less.

Any opinions??
 

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