I am going to assume that you are running stock heads, valves, springs, and rrs. I believe the max you can can safely go with your stock setup is....
FMS F-cam with 1.6rr.
(.512 exhaust and intake)
I ran the FMS E-cam with 1.7rr
(.498/1.6 =.31125 * 1.7 = .529 and I killed the valve springs in 10K miles.)
Look at the TFS-51402000 it shows a more reasonable lift at .499/ .510 intake and exhaust.
__________________
SC Motorsports
11801 State Road 52
Hudson, FL 34669-3092
(727) 856-8768
FordSpeed Racing
11733 66th St., Unit 123
Largo, FL 33773
(727) 549-8255
Dynojet Chassis Dyno