Dart Iron Eagle question

[el-camino]

hi,
anyone here with Dart Iron Eagle Platinum heads with 200cc intake runners and 64cc ?
i have this heads on my El-Camino engine:
GM Performance Parts 350cui block 12486041
DART IRON EAGLE Platinum heads 200cc intake runners
Professional Products Air-gap High-rise Intake
EDELBROCK AVS THUNDER 800cfm re-jeted
FEL-PRO 1094 head gaskets 0.015"
COMP CAMS XE274
COMP CAMS Valve springs, retainers, valvelocks
COMP CAMS Push rods chrome-moly
CLOYES TRUE Roller Timing Set
MSD 6T ignition system
MSD Billet Distributor
MSD 8,5mm spark plug wire-set
Splitfire spark plugs
Flow-kooler waterpump
Meeling Hi-volume oil-pump
engine-oil cooler HD
Fluidampr Harmonic balancer
RAM-AIR BOX

last summer i testet the Camino on dyno: 330rwhp
thats ok for me, but now i have a problem
the Oldsmobile from my wife is ready and i feel now, the engine in the Olds runs better ....and FASTER !
i build this engine for the olds with the same block, camshaft and so on. the one and only difference are the Vortec heads.

any idea ?