Well you don't want to run it more than 10 degrees initial advanced on regular 87 octane, so I guess my point was to check and make sure that the timing was set correctly at the factory. If you pull the connector, check the timing, and it's already at 10 degrees then just leave it. I know that my '93 came set at 4 degrees when it was brand new, it must have been built on a Friday.
Also, if you are running factory gears in the rear diff, don't pull out the cats and replace them with an H-pipe. We have found that on a stock 5.0 with stock (re-highway) gears, they like the back pressure, and it gets rolling easier. If you start changing gears and putting bigger exhaust etc on it then an H-pipe will help, but if everything else is stock just leave the cats in it (as long as they are in good shape and not plugged up).
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