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Have him check the distributor mechanical advance and see what the springs are doing through the curve... 
My 496 6 pack would idle like that too...sometimes not come down past about 1400 rpm.
Did the "weld up the slots" trick in the distributor and changed to light springs.....No more problems and a lot more response and midrange power.All timing in by 1500 rpm.
I run my 493 sixpack at 20 initial 34 total all in by 26oo RPM, but I have high compression and mix in some race gas.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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