carb decision nd help

Two7T3Dart said
600 vac. secondary, (not DP), or Carter/Edelbrock 625 will work well on your 318.

Just my opinion....you asked....

After seeing what you're working with, I have to agree with the above statement.

You can tinker with the DP, and adjust your driving style some (meaning feed the throttle vs mashing it), but overall I think you'd be happier with a vac secd carb.