Did you get a main cap girdle? The stock block is only reliable for up to 500hp/w girdle from what I researched when ordering my 331. I was planning on adding up to a 50hp shot if I ever felt the need for more speed. Even with a 50 shot I feel like I'll be pushing it.
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Rick
My 89lx(updated 11/5/2000)
My 97 Cobra