83 258 engine problem

[Marty Bricker <mbrickerusn@xxxxxxxxx>]

Took my daughters 83 Spirit out for a drive to see if
everything was running ok.  Engine started, idled,
accelerated normally and ran fine up until I hit 55
mph.  It was like a governor or something is on the
engine, it just won't go any faster.  It feels like it
will stall or backfire if I try to continue depressing
the accelerator.   I got it up to about 58 mph but it
was starting to bog down so I backed off to 55 and it
ran just fine.  I haven't checked the timing yet, but
anyone have any suggestions?  (83 Spirit, 258, BBD
carb that was rebuilt a little over a year ago. All
pollution gear is present, and, to the best of my
knowledge functioning.  Plugs, wires, coil, o2 sensor
replaced at same time as carb rebuilt.  It has the
Ford upgrade of coil and bigger cap).  Thanks.
Marty

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