what am i doing wrong?

ok mikel here goes.

comp. cam hyd intake .488 exhaust .491,
duration intake 230, exhaust 236.

heads: edlebrock rpm performer alum. 2.02 intake ,1.6 exhaust
ported , and polished . all opened too max and
portmatched . intake mani to head intake to exhaust to
headers.don't know flow

intake mani : edelbrock ld340

compression: 10.5:1

piston: je

rings: hand filed .040

carb: davinci 860(so i'm told. find no marks except 7915 on bowl).

exhaust: hooker jet hot coated in and out 1.69 tubes to 3" exhaust into
flowmaster 40's

trans: 727

torque conv: 10" 3000 stall

rear: 8 3/4 w hvy posi unit, 3:91's mosler axles

tires: front, 185/65/15 kuhmos , rear bfgoodrich drag
radials 235/60/15

dyno results: this the 3rd pull out of six, can't find 4,5 &
6 which had the 425hp results.
3500rpm 357.1 tq, 238hp
4500rpm 403.7 tq 345.9hp
5000rpm 391.3 tq 372.5hp
5500rpm 378.8 tq 396.6hp
6000rpm 356.3 tq 407.0hp
6200rpm 350.7 tq 414.0hp
6500rpm 317.2 tq 392.5hp
this was dyno'd with a 700 holley

timing: 35

hope i gave you enough info.

tony