I had a LD4b on my 318 with 302 heads and both were completly untouched and the port mis match was bad, you could look down the intake from the carb and see a big flat wall of the heads intake surface sticking in the port on the ports you could see through. Now haveing said that I do think it is a great intake but the ports really are closer to 360 ports than 318 ports. Also with the LD4B you have to find somewhere else to mount your coil. Port match it and it will be great, if you don't port match your heads then the stock intake and eddy carb sounds like a good deal