Choose between heads and CAMS

let me be the first to say, "God Bless you for your Service" and "Thank you for your dedication to our country"

On your question. Leave the heads stock. Dont mess with them. Your car is not going to be able to handle much more than 400rwhp.

The ford "PI" heads, are exactly what you have, no difference. Leave the heads alone with the stock motor. If you desire, run a set of blower cams, they will give you 30rwhp or so and a nice lobe at idle. However, dont get greedy with the stock bottom end. Slam that blower on, add a set of cams if you wish, and have the car tuned. If you wish to go further, have the motor forged, and when the heads are off, then take the drill to them. Already having PI heads, just have a local machine shop port them when you do get a built motor. No reason in spending a ton on name brand head porters. Good luck!

Mark