There are too many factors involved in tuning a motor. I can take a wild bet that your fuel curve is off. If it is too rich you will lose HP, If it is too lean you will lose HP. also are your cams dailed in for the RPM range of the stroker kit and also compression is a major factor. Bekker's had their engine finely tuned before it went on the dyno. Some companies run a hair lean to bum up their HP figures. If you give me more info I can tell you what to expect.

Stroke:
Rod Length:
Piston Diameter
Head Chamber CC
Compression Ratio
Camshaft timing
Compression test results
Transmission Gearing
Rear End Gearing
Tire Size and Diameter
Weight of Vehicle

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WARNING: Bastard Mercedes Builder/Tuner
Sorry if I don't answer your email or questions
I don't check here too often.
I am normally on the 190revolution.net board.
Thanks