392 stroker oiling problems

Yeah it is pretty fustrating when she comes apart. I am past the plastigage stage. What is the difference between lifter bore bushing an the tube? doesnt it acomplish the same thing? I have the right side tubed an the other side blocked. Would this not be the same? The two main I lost were 2 an 4. On the top I am running W2 heads an solid roller lifters, harlon sharp offset rockers an a 630 lift comp cam. How many horses can you expect to get out of a stock block? I know on the chev I had to go to a motown block because the walls were not thick enough. You can see more of my sport at www.ussbaracing.com Think if I can figure out this oiling I will definitly have an advantage the way our rules are written. I did order a book the other day but still waiting for it to get here. Could you explain how you plumb in the cross over tube on your motors? got to go. thanks