My 289 was rebuilt in the early 1990's. It is the original 289 4V engine in my 65 fastback. If I had to guess, I'd say it has maybe 20K miles on it since the rebuild (hard to say since I've only owned it since 2001).
My concern is the
oil pressure at idle. Once warm the pressure gauge (electrical) drops down to around 20psi possibly lower (hard to remember. It's been a long cold MI winter, and I remember being uncomfortable with the gauge reading.). Previously it would hold higher pressure at idle. I have in the last 10 years replaced the pump with a Mellings hi volume unit.
So my question is, do I need to consider a freshening, and what can I expect to save on a second rebuild? I think it still has the original flat top pistons, and the main journals are 10 thou under sized.