If you're going to build a motor, build yours unless you know it has major issues. There are so many non-wear parts on the OEM Long Block that you're paying for and don't need. The money would definitely be better spent on upgrading/freshening up your block. Of course, if money is no object and you want everything factory-fresh, go for it!

 

The miles on your engine doesn't really matter once it's rebuilt...

 

 

I would say build the old however we just put a motor in from Daytona in our MR and I was very pleased with the whole experience.