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Well the electric water pump is worth 10hp easy, I have tested this to death in the past. Heck, just a pulley change to under-drive the water pump is a solid 5hp.

Ported SV, may or may not show any HP improvement. They support almost 700hp right out of the box. It already out flows your heads.

600hp, I'll bet money on that, and then some! If it dont, there is something wrong.