Tai,
SVO sells bocks everyday as well as Dart that have the same deck height as your Cleveland and can be safely overbored .170" or more.Here's a link to a recent ad by the guy I bought me NASCAR engine from. http://www.nmraracing.com/forums/showthread.php?s=&threadid=20595
He is great to deal with and his parts are top notch,used NASCAR and ARCA stuff.
Good choice on the 180's What mufflers are you planning to use?I presonaly would suggest changing the collector to exit together out the rear AC condensor grill and NOT using the mufflers that Hall sells to go with his headers.Buy a ste of Magnaflow or similar "straight through",round mufflers and you will LOVE the sound!
Good luck!
Ron
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