I’m definitely with Trader Vic when it comes to their 1972 recipe here. A 3-rum blend really gives this drink proper character (but I hold to 2 oz of rum total, so I don’t end up under the table). It definitely should consist of #1) a light/gold 1-3 year, #2) an overproof/navy-strength, and #3) a heavy Demerara. My personal preference is 1 oz Plantation Grande Reserve (or 3-Star), 1/2 oz Smith & Cross, and 1/2 oz El Dorado 12 year. And yes - I love to load it up unreasonably with Angostura!