Ogre & Tech: Thanks for all the info & photos. They are a big help. Ogre, we wish we had the rails on your 58. There appears to be a lot more room. The rails on our advanced design 50 really pinch narrow from the cab mount forward. Then again, as we're learning, each build comes with it's own set of challenges.
Update: We refitted the engine last night, massaged the lower firewall at the cab trans cover and removed the fuel pump - victory! We have a good fit with ample dist, oil pan & trans clearance!
Now for a decision on the fuel pump. We can modify the cross member & rail to allow for the mechanical pump & fuel line connections or go with an electric pump. Any more opinions on the efficiency of each - pros & cons? So far our thoughts are that placing an electric on the rail provides accessibility and eliminates the need for additional mods but will of course necessitate spending $ which is fine if it improves efficiency. Modifying the frame is more work but since we already have the pump, it's free.