yet another 318 build question........

the problem with the 340 intake is the ports are bigger than the ports on the 318 heads
that is why I suggested using different heads, you may be able to open the 318 size ports to match the 340 size intake but you still have the small 318 valves, you can install 340 size valves in the 318 heads, but now your getting close to the cost of a new set of heads