I really think that 200hp to the wheels is possibe. The broblem is the contour is a pain in the ass to work on. The reason I did the 3.0L was because to replace a rod bearing and rod from a sun bearing I was basically going to have to remove the motor to get the back side head off. It was more cost effective to just yank the motor. just my $.02
Roger
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98 SVT E0, Black
97 GTI VR6, Green
88 Mazda 323 GT Turbo, Faded