Also, as far as swapping in a Diesel, depending on how much torque you're planning on having you may want to put a 1st gear lockout on the tranny, one of my dad's friends swapped a small block chevy into a Porsche 914 and the torque was enough to strip the teeth out in 1st gear (luckily it didn't damage much else and he was able to use the trans, after he took it apart and pulled the chunks out)
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