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I have people safely putting 425hp through 915's.
The part your missing:
The 915 is not geared correctly for any of the SBC's. 1st is way to short and 2nd is a tad too tall.
All your numbers are dead on for parts and rebuild prices, but have you priced the tall R+P for the 915 ? so it makes the box livable on the freeway and makes the gears "better".
Again, your right back to the price of having a 930 box purchased and flipped. Same cable shift linkage crap and same clutch arm headache (in a 914).
Until you drive a V8 car with a 930 box.... you will never know what your missing.
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