They are for a 454 I believe
39999289
T0114TSD
CSA 133865 or S

Yep, my info shows 72-75 454.

Manufactured in Tonowanda, NY on Jan. 14th.

Cast crank - #353039

Heads that came on it - 336781,353049 or 6272292

Truck engine that could have been 215hp or 250hp, depending on VIN letter. In 1975 it was 215hp (LS-4). In 1977 it was 250hp (LF-8).

It was backed by a TH400 tranny