I have posted elsewhere in this forum that I have always wanted a Commando, but never ridden one, though I have been riding for 40 years. Now, I am going to look at a Commando with a Combat engine. Don't think it was original since it's on a '73 bike, and I thought combats are on '72 bikes. The seller told me, "The engine was modified with superblends,4s cam ,60 over 11 to 1 JP pistons, head was sent to England install big valves by Mike Hemming ,Mikuni bore 34mm, Paxton ignition, belt drive , high output coil and much more." I honestly don't know much about it, though I have read whatever I can put my hands on. What should I look for? What should I ask about? Thanks.