They repro just about everything these days but some stuff they dont. -- there are still holes in the 289 hipo land.
Tim , is there a particular year/race car you are trying to emulate >?
Specifically in engine land , there are a few key items that will point your build in a particular direction.
like , some of the early 289s had an
oil fill in the front timing cover, and solid (no holes) in the valve cover.
I have several various vintage 289 blocks and can show you the differences in person. --
Larry is working on a vintage 289 build right now for a customer that would be a good reference piece for this project.
I also am working up a 289 D code build here in the next few weeks as we have a 64.5 convertible we are working on with a build date of 4.16.64.
(made the night before the mustang was released)
Steve