Just Blew 2 Head Gaskets at Once. First Run

Hey, I just set her on the ground for her first test run after engine and trans rebuild. I put some .028 steel gaskets on a 318 with 302 close chamber heads that were just built and milled with 360 valves. Stock pistons, and yes I used the old head bolts...Ran around the block a couple of times and man she sounded good and the trans shifted like she was ready to launch. My Mopar friend came over so I took him for a spin. I had not hit the kick down yet, but I did with him in the car. Next thing I know we are white smoking out both exhaust pipes like masquito foggers. Back 2 plugs on drivers side and front 2 plugs on pass. side have 50# comp. What head gaskets should I go back with ( with new bolts)? Is that .028 steel gaskets too temperamental to precision on surfaces, and will a .043 Felpro solve this problem? Any advice, or repromand appreciated.