For street driving I don't think I'd spend $700. Since you are running primarily bolt on speed equip that will give a reasonable boost with the stock ports I doubt you would feel the difference even if you covered the seats with sandpaper.
If the port work flowed better than the Offy intake and the exhaust system then they would be the bottleneck. Maybe a nice port match on the head and manifolds is the best compromise for what you are doing. You won't feel that either on the street but it makes good bench racing when showing off the car.
