My vehicle is an 87 S blazer[stock engine was 2.8]with a 3.4 crate engine,engine came with a mild 260 upgrade cam and I added a larger 4.3 tbi and freeflow catback.I had picked up a 7427 ecm but after some reseach I feel that the stock ecm w/chip would probably handle the needed tuning for these mild mods.I can save the 7427 ecm [5.7] for another project or mostly likely sell it.What is your opinion ?