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Which Trick Flow heads are you using? Keep in mind that if you use a twisted wedge head, that you'll need different pistons.
Also, keep an eye on piston/valve clearance. Those 5.0 engines don't lend much in the way of room and if you go much over .500" lift, you'll run into some issues depending on the camshaft.
While you have it out, it would be a really good time to put new rings and bearings in it, along with gaskets and a rear main seal.
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