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With the exhaust, longer and smaller manifolds will increase torque, shorter and larger manifolds increase flow capacity I.e. more hp at the top end.
I would definitely shave the head to increase compression, it will increase efficiency and therefore power throughout the rpm range.
Ignition, more energy in means more power out. Get a bigger coil if feasible, search how to retrofit coil-over-plug ignition systems, it pretty simple.
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