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Do you mean 170hp to the wheels or at the flywheel?
I'll assume flywheel...which means you have 140hp stock with the SOHC. So we're talking another 30hp.
I/H/E is start...probably 15hp gain at the flywheel. A good cam should get another 15hp at the flywheel....walla, you're done. Now if you want 170 to the ground, you'll probalby need somewhere around 190 at the flywheel...another 20hp. A lighter crank pulley will probably free up about 5hp. Port and polish will probably get 8-10hp. Then maybe if you could do some milling to bump the compression up and maybe run higher octane, you might could hit your mark. Of course, all this is just a big educated guess. It's possible to get that kind of power out of n/a, but it may take more or less than what I've just stated.
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