Thanks for the previous answer regarding the Euro cam. Regarding the mandral bend for a free flowing exhaust: how much HP do you think you will get with this, and will the HP be more at high rpm with more torque "stolen" from the lower rpm's, or will the HP be more evenly distributed? If the stock engine puts out more power, do you think it would then make sense to eliminate the speed limiter? Finally, you said the HP was 185. I thought the HP for the early 300E's was 177. Thanks.

The 185 was the "EURO" spec for the euro motor!
There are computer programs to "plot" HP gains & losses depending on the changes made to the engine. I use this type of program for My race car & other engines & IT has been very accurate. ON the Dyno the responce is almost what the program predicts, within 2-3%.
Most of the time a cam will "raise" the torque starting point by 500-1000 RPM.
Almost any time a good exhaust system is done you can pick-up 5% of the rated HP.
Try by-passing the fuel pump relay cut-out to see if the extra RPM is worth the wear on the engine.
Max torque was at 4400 RPM & HP was at 5700 RPM.
The engine will rev higher but HP will just fall off as well as the torque.

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Thanks MB Doc. As usual, your answers are clear, concise,and to the point. Much appreciated.