Sky here is what I would recomend first off With only a 600 carb and performer on those heads I would run a 1" open spacer between the carb and intake. secondly I would seriously suspect ignition for the lack of top end power at one point I had a stock cammed 289 that would only pull to 4000ish then I put in a mallory distributor,coil and hyfire 7 module. all of a sudden it would runn right up to 6000 (power was really done at around 5500 though)You don't have to use mallory but get a good CD style ignition on it.(the pertronix is fine for the distributor as long as your advance is working properly. I would also keep bumping up your timing to where you just about ping and slowly back off each pass till you start to slow down then put it back on the last run. Also does he have traction bars or anything? Even with the peg leg he should be cutting 2.0's to low 2.1's on his sixty.
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