Hi Jeff.
I'm wondering if the car pulls better up top just because of the shankle headers and lack of resonator? She's still a bit tepid under full throttle, but it's OK, I really like cruising around and running errands in it.
Unless the pump was modified by Wes Ingram or something, I don't think hotter cams would make the mileage any worse. The fuel delivery system is fixed, so, if I flow more air through the engine because of cams, the Spica won't know the difference, and just deliver fuel based on RPM, air temperature, and throttle load (I'm not 100% sure about the RPM tidbit, but I don't see how it could run well with out knowing RPM). So, if anything, I should get better mileage with hotter cams (that increase low RPM performance, like Euro cams would) because I should have to use less throttle to accelerate at the same rate. I'm in no way an expert, this is just what i've read so far.
I am planning on pulling the valve cover to seal up the gasket a bit, I'll check the cams out and let you know what I find! But, I still have a hunch it has stock cams

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1987 Milano Platinum - check for many new items.
PARTING OUT
1989 Verde - Harsh shocks and SS rears, 27mm torsion bars, stainless lines, pads, 16X7.5 rims, 4.10 rebuilt platinum tranny, poly bushes, and RSR 28mm front and 25.4mm adjustable sways!
1984 GTV-6 - 80K miles