drill flex plate?

So I spent several hours trying to get my new Turbo Action torque converter (17805ST) bolted to my B&M flex plate - I tried all 4 possible positions several times - it's just not mating up. I was able to get three out of four bolted up, but the 4th one just isn't going - it's about a 16th off, maybe a hair more. It has been suggested that I drill out/open up the one hole in the flex plate that is preventing me from getting this done..
So I am looking for additional advice - to drill the flex plate or not, that is the question.