I'm thinking the pin overlap might be adding to the Eagle crank failures. A good many of the failures are from people with engines far beyond any cast crank usage, like really high RPM or boosted applications (nitrous/etc.). Your lightweight skinny rods will help and the low RPM ceiling.
When they let go, it ain't pretty! That one lasted a good while under extreme use, but I bet Gary would have eventually broken a SCAT cast steel unit. I bet you'll be OK with the shorter 3.58" stroke, I hope so anyway. I just bought a crank like that from Eagle's Ebay store, a blem unit. LOL
It's crazy you had to prove it's a 318 like it's impossible to make power with anything less than 340/360 guess that's the line where physics stops working. Sucks she let go on you, doing another 318 or moving on to something else?