Like I said, there are a lot of variables that go with the cam, you first need to decide where you want the power:
1000-5500 RPM (stock)
1500-6000 RPM (mild)
2000-6500 RPM (aggressive)
You also have to have it match the intake airflow. You also have to decide what year you're going to get, cams that work well with 87-93s won't work too well with 94/95s due to the ecu in that year.
1.7s will work well with anything, as stated they add extra lift to the cam.
331 would be the wiser choice, you'll get good power and good torque and will have much better engine life.
GT-40 heads are cheap if you get them rebuilt/cleaned off of ebay, but I'd spend the extra few bucks and get GT-40 X303s as they're lighter, and flow much much better. GT-40s are only mildly better than stock and really not worth the extra cash. Because if you get a cheap uncleaned set off of eaby, by the time you rebuild them, you just bought a set of GT-40 X303s. Keep an eye on ebay, you can usually pick up a set of X303s rebuilt for less than $1000 and they generally cost $1000 per head.
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Trinity 99 Mustang SVT Cobra 280 rwhp, 290 rwtq
Selena 95 Mustang SVO GT-40 250 rwhp, 275 rwtq (Under Reconstruction)
00 Mustang V6 (sold)
98 Mustang V6 (sold)
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