Well I took a chance and put the engine back together with the heads that came with it, I installed it in my 73 Camaro with a 4-speed and the engine is awesome so far, you guys was right I adjusted the valves and maybe that was the problem the first time, but now there is no spark knock or nothing she runs great on pump gas, you know I said the last time I had to run racing fuel, I didn't think that there was that much difference between a stick and auto tranny just by the way a engine would perform, WOW!