You can have erl sleeve your block and not a new core so you keep your matching numbers. That's what I did on my gto.
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06 gto Maggie 489 rwhp sold
05 gto ERL/HKE 454 609rwhp na sold
06 Z06 500 rwhp sold
10 2ss ERL 427 530 rwhp sold
14 1ss 1le
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