1963 was the first year for an alternator. It bolts to the cast iron exhaust manifolds that you don't have and to a top bracket that bolts to the water pump.
So you can have a stock exhaust or tubular headers with that bracket that you do not like: pick one. Other alternative is to switch to 1968 and up heads with front accessory bolt holes that requires a long water pump (and long water pump pulleys) and use the front of the head holes to bolt your alternator and power steering pump up to the head. There is no stock appearing mount solution with headers.