They’re also very popular on dirt tracks too. There’s a team running and winning with them out in Iowa. The blocks are durable as hell and gain easily go .090-.100 overbore without any shifts or overheating problems. The dirt track team I’m talking about claims to have taken one to .120 over after a good sonic check. If I had the coin, I’d rebuild the one in the Polara, drop a 4 inch stroker crank in it, bump the compression to 10:1, port the heads a bit, slap some headers and dual quads on and go big block hunting