It looks like between Mark, 200toncapt, and the Delco EST info, you're covered.
I find it interesting that Delco lists the following, and then gives us a warning at the bottom.
Not that I disagree....... we should always use the OEM numbers.
ENGINE INITIAL TIMING TOTAL TIMING
CID @ 500 RPM........... @ 4000 RPM
181.......... 0o................. 24o
250 .........10o................ 32o
262 ..........2o ................ 24o
305 ..........8o .................26o
350.......... 8o .................25o
454 ........ 12o ................30o
552 .........12o ................30o
Warning: These timing Numbers should be verified with your owners manual.
These are not necessarily true for every engine setup, and variances can occur.
Use these as a reference base only.