rods got to go

I have to get new rods. Have 1737692's but 2 of them have DF81 on them and the rest have DF157 and have more metal. I looked them up but the DF numbers did not come up at all . any info would be great. And if anyone knows of a place to buy some rods that are not $400 that would be great.:doh:

1970 Challenger R/T 383 B
Author: gunnerman