Do you know the details of the engine? Compression, camshaft, heads, etc. I just put together a 70 340 with 10.5 compression, x heads, a nice hydraulic cam and I am running an Edelbrock performer rpm intake and an edelbrock 750 with electric choke and the car absolutely screems. I have an auto trans with a 2000 rpm stall and 3.23 gears. Hope this helps.