Myself I would run a bigger carb then the 750 on a BB stroker and I do. I use a Holley 850 DP on my 493 and actually I feel it would be faster with even more carb. But it has run 10.70's in full street trim through the full exh with the 850 DP. I love the DP carb on my car and most cars but there is nothing wrong with running the vac secondary carb on your car if you like it. I would just run a larger one if it were me. The vac secondary can work fine for you. Myself I like the double pumper carbs since I like to race my car at the track sometimes but you can use either the DP or vac carb on your car. Ron