750 Holley or 650 Holley DP carb for 340-4 speed?

Since its mostly track i have one question, will you be lifting in between shifts or power shifting? if lifting i would go with a 650 or 700 DP, if power vacuum sec 750 will be fine. i would also stick a 3.91 or 4.10 gear in it to make that small block bogie.