I have had two 428 CJ engines and the first was punched to .060 and it ran hot any time you stopped at a signal. The other was an incrediable engine with two sleeves and only bored to .030. I put over 4000 race miles on the engine and it would be here today had I headed my warning when my
oil pressure dipped from 50 psi to 10 or less. That was my indication I had spun a bearing. Instead I continued to race at breakneck speed and the engine let go at the start finish line at Texas Motor Speedway. I should have put my car on the trailer.
To sleeve an engine is about $100 per cylinder and I would argue that it will make the engine even stronger if the sleeves are done correctly. Given what you have told us I think you should be able to rebuild your engine and even add a few new things to it for around $3500. which is the cost of a good used 427 block that will need some machining and all the guts to make it go. Your rebuilt engine would be dependable and quick.
Good luck with your decision.
Clois