I read all three of the manuals I'm referring to as well as view the replies here. Majority says just use the valley pan. So I went ahead cleaned it and installed it with generous but not too much black silicone provided. Block heat crossover tubes? How would I have done that? The valley pan doesn't cover them up all the way when I installed it? Is it going to be ok installed just how it is? I'm running this 400-4bbl stock in my 73 Charger with even the OSAC valve hooked up, the vapor canister, ported vacuum switch, and the heat stove when I can find one. So don't I need to keep the crossovers unblocked?