Drive Train Upgrade Suggestions

Everyone ... Many thanks for the input and ideas. A couple people asked about budget, which will top out around $25K for the restoration work, net of what I paid for the body. The car arrived this morning and appears the body prep work will be minimal). This will be driven significant distances to events, errands and joy-riding. It came with a 225 Slant-6 from a '68 Dodge Dart. If an engine swap was made, are there any that would not require mount fabrication? Also found this YouTube video () of an optimized 225 that seems pretty amazing as well. Would need to assess costs of this option that would require a full tear down and rebuild of the engine + the weber carbs versus a new drive train as-is. Wanting to get the drive train determined se we can measure and make any needed changes before we take the body off to strip/prime and send to the paint shop. Additional comments welcome ... thanks!!