I feel that you’re caught in the middle some and if you’re looking for more at this point, IMO, you have tipped over into the next set of gear, everything drivetrain wise. You could, as of right now, use more stall and on a cam change I’d look for a cam on a 108 LSA, duration of about 6-8*’s more and then adjust the converter.
Problem is…. Solid cams aren’t readily found in that duration area. The converters re-stalling is expensive and we did t get to the gears yet which is the “Other thing” that will show a bug improvement.
Let me illustrate what I would step up to doing from your combo;
750 or that 800 Carter carb, 3200 converter, 3.90’s and the cam below;
https://www.hughesengines.com/Index...&level2=RmxhdCBUYXBwZXQsIFNvbGlk&partid=30396
This would cruise just about anywhere and do it easy w/reasonable mileage and have very good street power.
It’s also an engine build that I’m gather parts for right now.