Hi should be fine to just put the engine straight in, changing the gears clutch bell(pinion) gear or diff gear should only change the gear ratio eg. acceleration/top end speed...the pro has the same grade metal as the standard and other version apart from the diffs of coarse they have different diffs from the standard ones not sure which diffs come with the tq but i presume it's the same as the standard hyper 7...just make sure you have the mesh correctly adjusted to suite.