What duration and are you using the stock rockers?
I don't think you will have a problem with that cam.
Bolt 1 of them on with out the head gasket turn the motor by hand and see how much you clear by. You can use clay to check clearance.
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James Cox
nochevy@hotmail.com
1991 Mustang LX
12.565 @109.38mph 1.764 60ft