[hi-tech cobra]

Phil, thanks for the post. I saw your gallery...great looking motor! I just read an article in 5.0 magazine. They did the same 4.125 overbore on an 'R' block. The article stated the larger bore and longer piston skirt would eliminate the piston rock problem regular 347's have.
I am weighing my options now, and considering going with a similar setup-maybe the new Ford 302 boss block. Friends are telling me it's overkill. What do you think?