I have a 70 HP383 with about 1200 miles on it and it seems to clatter when you get to 60-65 mph on the road. I have anew Edlebrock 800 on it and everything else is new. I have a couple of lifters that tick when you first start it for a little while and they are MP with the MP 474 cam. If I had some flat lobes would it be missing some? It doesn't run hot about 180-185. And it has no power at all, I just need to get this figured out. It is 30 over with KB's all balanced with 906 heads and the block and heads were shaved. There is just the one spot where it does this and it starts good. I have replaced the plugs and points also. Does any one have any ideals? Thanks for any help. Ronnie