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The Berg trans install requires a modification to the body above the torsion tube for clearance. The Berg trans is custom for each customer so you pick the gear ratios and other parts to determine how strong it will be. With only the Berg conversion parts, it is only as strong as a normal type 1 trans.
The 901 is the cheapest to install (if you can find a good used trans), requiring a little fabrication for front and rear mounts and shifter. It should be good for 250HP but drag starts can hurt it.
The 915 is slightly more difficult and much more expensive to install than the other two. It requires the same fabrication for mounts/shifter plus you have the clutch/flywheel/release bearing to deal with. I have read that 914 parts can be used but when I measured my parts it would not clear, there is not enough depth in the bellhousing. Kennedy Engineering makes a conversion flywheel that uses 911 clutch parts and makes it work but it is $$$. My 915 trans had 930 size drive flanges, that's another $500 for CVs/axles/stub shafts. So a more expensive trans + clutch parts + drive parts + big $$$$ but results in a very strong installation.
ken
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