273 cam & crank timing marks, confussed

Go with the 12 and 12 method and make sure when you install the oil pump driveshaft and distributor gear is pointing toward the #1 cylinder. So when you install the distributor you will be good to go. The gear will spin some when it finally seats so you have to compensate for that.

Good luck on the 273 but I have tried everything to get some low end out of it and I have did nothing but wasted time and money. Mine is bored .060 also. It takes nothing to over cam the motor also...been there done that. A .441 lift or .420 is about as far as you can go with the 273.....anything larger than that you can say good bye to low end torque.