The filter is only for a crankcase vent, if you wish, seal the draft tube and put on a PCV valve, or O.K. to leave as is, only problem would be if the engine has lots of blow-by oil will drip from the tube called road draft tube. The single point front mount is only to be used with the bellhousing mounts at each side. If you don't have these side mounts the engine will move sideways and tear off hoses, wires etc. All early truck bellhousings come with the mounting holes for the motor mounts. The GMC 270 has lots of torque and needs to be restrained from a lot of movement. Great choice of engine I think. I had a 270 in a '39 Chevy years ago and it was great, but broke many transmissions, early Chevy transmissions aren't very strong.
