Anybody have experience with them and even more so this engine? Really interested in it? whats your take? Thanks...

I do not, however I have been looking at the same thing. What I can tell you is I have a buddy with a full race 340 in his Dart and had the work done at MM. His engine has held up for quite a while now and is in the mid 9's, and he seems quite satisfied with their work. We don't live too far from them and I have never heard anyone say anything bad about what they do.

2 of my buddies had magnum 408's built by them years ago and both of them were messed up. The bores were not right. I personally would not use them, although some have had good luck with them.

I've bought plenty from them. They do a good job. I ran a bracket motor that they built years ago and was very happy with it.