I am not really a fan of external pickups as they are more easily damaged. That being said I see no reason it would not work. The OBD2 covers are getting harder and harder to find because they only used them for 2 years and many people are doing these swaps. The hub is an easy fix, just mill it down the width of the reluctor wheel and good to go. I milled a performance Fluid Dampner down for my 5.7 Vortec when I did the 24x swap on my Express. They did not make a Vortec specific dampner at the time I did my swap and I doubt that they currently make one. Turning 6,000+ on a stock rotating assembly I figured I needed all the help I could get to protect the nodular iron crank. I am actually running my Express on a 2003 based Express van 6.0L PCM. It was out of a DBC van but have now gone drive by wire. GM also has a 1 meg 350 calibration they used in Mexico and South America on the 5.7 L31 in a GMT 800 truck that can help with initial tuning. I would recomeend dual knock sensors with the conversion and mirroring the knock table values for the even cylinders on the odd bank. Makes for a more accurate system and less false knock retard.
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