The basic specs on my motor are in my sig. Right now I have a 3310 750 vac sec Holley and Im unsure if its is the ideal carb for my Z. Barry Grant chart says 650dp is the ideal set up for my motor specs but all the mags seem to use 750's for he tests. If I was to buy a new carb should I go for the 650 ,700 or 750dp?