Re: 454 engine ?
Agree with the above,..in the old days, the sleeves and process wasn't too good. It's from that that sleeving had (or still has in some cases) a bad reputation.
Today, sleeving if done properly is the way to go intead locating and purchasing another block.
Many of the 302 DZ blocks these days are sleeved because there simply weren't that many DZ block produced. So are many of the 400 blocks because you can only bore a 400 once to .030 and then next time, it will need sleeves.
But on 454, you can bore to .090 I believe or more. It must endured a broken rod or something at one time.
Sleeve with confidence!...good luck!