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there is a ton of info on thirdgen.org regarding ecm swaps, in particular, running the vortec engines with an LS1 ecm. The LT1 engine uses the same type of crankshaft position sensor, so if you were to rework the intake to use a vortec distributor or retrofit a regular dist for a cam position sensor, its somewhat straight forward. look for a thread entitled 'obdii tpi' or something like that. The LS1 pcm (I guess; its part number '411, the right pcm) was used in express chevy vans with the old style vortec SBC.
there are tons of options out there....it really depends on your skill level and how hard you want to make something different.
personally, I think its a crock what these software places charge for OBDii tuning software with 'credits' and 'vin locks' and all the other bullcrap so I would still use OBDi where possible and any freeware or 'reasonably priced' software.....
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