SB 318 Wanting to build for a 67 Dart GT

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67-75 318 2536030
76-79 318 4006730
80-83 318 4104230

71-74 360 3418496
75 360 3870230
76-80 360 4006830
I did a little research and came up with 76-79 318 for those numbers on the motor. You have "302 swirl port" heads from the numbers you gave and they are great for that motor. Go with your plan, maybe replace the timing chain and oil pump too. X2 on Rumblefish's cam, it should run strong. You'll need to replace the stock pistons to get above 9-1 CR, that would mean rebalancing the rotating assembly. While you have it apart check the bearings too. I run a 727 in my cuda with a 318, my opinion is use the 904 instead. It will be better off the line. I'm getting ready to replace my 318 with a 360 and I'm going back to a 4spd. That 318 would be fun with a 4spd, but thats a lot of work to do on a auto car. Check out this link for more info on the heads...http://www.1962to1965mopar.ornocar.org/ml-pitchercastingheadarticle.html