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Every alloy block made uses sleeves in all 8 holes. There are tons of 427 blocks out there. The trick is finding one without going more than .030". Cost is obviously a factor. Nice side oiler blocks are not inexpensive easily getting 1500-3500 pounds plus shipping.
If you can get a good machinist to do the work and have a block, I'd sleeve it. I've seen these blocks go out to 4.250" which will get you 454 cubic inches. It happens to be a very inexpensive piston to get.
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michael
A man that is young in years, may be old in hours, if he have lost no time. But that happeneth rarely. Generally, youth is like the first cogitations, not so wise as the second. For there is a youth in thoughts, as well as in ages... Sir Francis Bacon (1561-1626)
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