The springs that come on AFR185s are good for up to .550 max lift. and have 2.020 values.
E303 - .498 max lift with 1.6 rockers,
F303 - .512 max lift with 1.6 rockers,
F303 - .544 max lift with 1.7 rockers, (.512/1.6=.32x1.7=.544)
1.6, you should be good.
1.7s will work for the springs. As far as clearance, guess everyone else has already covered that.
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SC Motorsports
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FordSpeed Racing
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(727) 549-8255
Dynojet Chassis Dyno