if you used RTV for the lower to the heads you have a serious fail underway. the gasket has ridges to make up the gaps which are like 1/8" thick. I have done tons of them and they suck to do. but they are tricky with the two sizes of pushrods from intake to exhaust. as for the uppers if you still have them they could be reused.
oh by the way, if you have any RTV in the system that goes into the combustion chambers , as it burn it takes out your O2 sensor...have fun.