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Cannot exceed 5000 rpm under load

Fuel System

Model: 928, Year:1979, Mileage:unknow, Type of use:Track use only
1979 928 track car with 4.7L rebuilt motor (from J. Thrift's old car). It was running better than ever before "kissing" the tire wall after Turn 1 at Mosport summer 2009. Ever since then it will not exceed 5000 rpm. Starts and runs well otherwise. All injectors are functioning at full throttle (verified by removing them, inserting in jars and jumping fuel pump relay leads). Fuel pump replaced in Oct 2008. Any ideas?

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