This is odd. I had the exact same problem on my camaro. It was always very bothersome. I narrowed it down to two solutions that may or may not have been the fix, I will never know as I recently sold my car and engine and trans.
1) Retard the timing a bit, and see if it starts up.
2) If #1 does not work, I would look at the flex plate being bent.
I retarded the timing a great deal and it actually started a little easier than normal, with minimal(but still there) grinding. I had concerns the cam was installed wrong. After further review my engine builder flipped around and gave me good cause to believe it was not, take it for what it is worth. I trust my engine builder with my life, so I trust him with my engine's as well.
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