I have done many of these bikes and are really good bikes if done right,this bike will take lots of dollars to make right,the 72 combat was the only year for the shaved head and first year for 32 mm carbs,the cams were big and often caused coil bind,so on mine I put in a megacycle and mikuni single carb kit,made it quicker and very user friendly ,the noc,is a great resource for tips on these bikes.bill