First, are you sure the gaskets were for a 403 and not a 350 or 455. There is a difference. Second, the Fel Pro's are all you need. Don't waste your money on the coppers. Third. Did you have the heads cut or the block decked ? If not, or only the heads cut, I would check the deck surface of the block or both. Safe to say you did open up the dowel pin holes deep enough for a good tight seal. You should'nt need new bolts but I would replace them if they have been torqued more then twice and don't forget to oil the threads bedore you torque them down. Hope some of this helps.
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