The 1.7 roller rockers are fine. Don't expect to pick up much power with them, though. Basically what the rockers do is give a mild cam effect. You don't really need any more cam, but the valvetrain friction will drop.
Gear installtion is left best to a professional, expect the install to run about $200-250.
1500 at 55mph sounds a lot like 2.73's, but I'm assuming you're going by the factory tach, which can be off quite a bit. Best way to tell is jack the car up and have somebody rotate the wheel. 1 Spin on the wheel should be 2.75 revolutions on the driveshaft. In any case, you've most likely got stock gears, 2.73 or 3.08.
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