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I did the same. The hole only needs to be widened by couple millimeters (not so much you can't do it with a large half-round file if you go at it carefully and evenly). Been maybe 12 years now since I did mine.I’m using the original 2.9 block plate on my 4.0 clutch conversion. All I had to do was to file out the opening ever so slightly for the starter to fit. I’ve had no issues for 15 years and 80k. Still going strong. Best upgrade I ever did to my truck.
I saw a thread a while ago (a few years now) where someone did the 4.0 clutch to a 2.9 without doing anything with the block plate and really buggered up their starter from it being in too close.I did the same. The hole only needs to be widened by couple millimeters (not so much you can't do it with a large half-round file if you go at it carefully and evenly). Been maybe 12 years now since I did mine.
I can see how not having the block plate at all would cause issues though.