Agree with everything in coreywoodworking's post. Beyond the aesthetics, the angle and height of the traditional transom and counter seem prohibitive to transom mount.
I upgraded in 2001 from a Johnson Sailmaster to a new Yamaha four stroke 8 hp long shaft with low-pitch prop. The 8 hp is in the same chassis as the 6 hp, ie nice & small. Would've put the Honda or Yamaha four stroke 9.9 in but neither fit in the well.
In everything but dead-on short chop over three feet combined with breeze over 15 kts, the motor is adequate.
1967 Bristol 27 hull #0177