Hi, I have a Monster Moto MMB80 and a HF 212 predator engine. I have modified the air box, removed the front oil drain plug to place a set screw in the hole to allow more clearance. I believe that I have the engine in the correct place, I have check the alignment of the chain and everything seems to be OK. The only question I have is how should I drill the holes? Should I just mark with a maker? Any help will be appreciated