The 340 is the biggest POS V8 Chrysler ever made.

I had a 65 Valiant with a 340 that was a heap. It had super stock springs, fence post for frame connectors, 4.30s, sportsman pros, hooker Fenderwell, low gear 904, and basically a stock 340. It ran 12.20s when I bought it and I got it to go low 12.0s. I paid $2000 for it.