Looking for advice/insight on car

I believe the initial is at 18 and it's all in by 2500 or so, I didn't change the springs or the bushings from the factory, I can't remember exactly and it's put away for the winter currently, while I work on other projects. As for the torque converter I bought this one because I was short on the funds and I needed a TC that would work, the stock one (the one that came with the car) wouldn't let me get more then a half mile down the road without loading up and killing the car, this one fit the bill because of cost and stall speed. I would love to buy a custom TC for the car but as always I am low on funds and this isn't the final set up of the car, it's only a temporary set up as I have a 440 in the shop that I would really like to build up to do some real power, when I do that I will buy a custom TC. The rear shocks are adjustable I believe they have something like 15 different settings on them.

I know that it likes to rev, when driving it as soon as you hit the 3000-3500 it just starts to pull like a freight train and it's all out of steam at 6000, I know the stock heads are the hold up now but I just can't afford the cost of aftermarket heads at the moment.