The 68-69 327 cranshaft has the same main journal diameter as the 67-94 350 also the same rod length .The greater stroke of the 350 is generated by a longer throw of the crank.The piston bore is also the same.Use the 327 crank, rods and piston's together.If you use the wrong combination of parts , like a 350 crank with 327 pistons your pistons will crash into your valves. If you go with 64cc heads or less you shouldbe able to keep your compression up. Edelbrock,Jegs or World Products ,your choice.