oh, I was wrong then actually.
The performer will work fine if you use the correct gaskets. I believe the info you posted is right but I cannot verify. The gaskets you use should match the year of the head.
The middle port is exhaust crossover and serves to warm the intake. It's not a performance affecting feature. The rest of the intake will match up with the ports just fine, so don't be too concerned about losing performance. Just fix the leaks and move on.
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