I'm wanting to ditch my OLD low hanging headers, are these manifolds worth it?

Well, I didn't build the motor. going off what was told to me by the 3 previous owners (which none of them originally built it either) Was told It runs best on 90+ octane, has a cam of some sorts, LD340 intake with Holly 4130 dual feed carb, not a loping beast but sounds and runs good. It's a driver, NOT a drag car. 727 trans, 8.3/4 with highway gears (probably 3.23s) 15" tires. FOR SURE I don't drive it all year in Alaska :rofl:
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nice car alaskajeff