On most Panteras, it's possible to remove the entire idler pulley and its mount, and adjust compressor belt tension by shifting the compressor itself. This is easier with the much lighter weight Sankyo/Sanden aluminum compressors, and cleans up the front of the engine for easier servicing.
Second observation: engine vibration will flex aftermarket crank-fire pickup wires and eventually crack some, especially if the leads are short or unsupported. One owner went through three Electramotive pickups during a 700-mile round trip, due to too-short leads. Once home, he extended the leads and tied them down, and had no more problems.
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