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I have a 1998 Lumina with a locked-up 3100 that needs to go. I have access to four 3500s with around 50k on them that I can get for $300 each. I also have a 3400 that needs a rebuild and I have not decided which way to go. The thing that is keeping me from making a decision is tuning OBD11. I would rather put a 3500 in it but I was wondering if any one here could flash the stock 3500 fuel, timing, ve table, etc. into my ecm. I will probably put it in stock for now but if anyone knows of headers that will bolt on to 95-98 Luminas or Monte Carlos, I would install them when I put the engine in. I can get the 3400 stuff flashed into my ecm with no problem but I do prefer the 3500. Thanks in advance for any help that you may offer.