This is not a good idea, you will definitely have an imbalance problem. L67 engines require the external weight for balance. As previously mentioned, the flexplate will only bolt on one way which will locate the weight in the proper position. what has not been mentioned is that the flexplate to crankshaft bolts are tty bolts and should not be reused. I am sure a dozen people will post that they reused them, but it is not the right way to do it. If you reinstall your original flexplate with new bolts using the proper tightening procedure, you will be fine. My 2cents.