If you are serious about an aluminum block, like a Rodeck or Brodix, they are very similar, Brodix copied Rodecks design, hang around some sprint car guys. They will only repair a block 2 times before it is scrap to them. I picked up a 93' Rodeck Block that had been windowed twice and been repaired buitifully. Once they blew it up again (blew the No. 2 web out) they were going to throw it away. I picked it up for $650. Had to get it fixed, that cost me $1000, but I had to covert it to wet sump. Believe me I'm not rich, took me 5 years to build it. I leaned a lot. If you get a good machinist they will help guide you, mine did. The only problem finding a used block is the deck height and most newer blocks the sprint car guys are running don't have starter or fuel pump provisions anymore, weight you know!