It's probably running lean from lack of fuel. A street ported engine should feel a nice kick in the pants at about 5200-5500 and pull all the way up to as high as you dare to rev it.

Wait... *what* DCOE carb do you have? Know what size? One or two carbs?

Commonly installed is a 45DCOE, which is about right for a stock 12A. You'll be wanting something more biggerful for a raunchy 13B.

 

Yea, it's a 45DCOE. What carb would you suggest? I can't get it now but I'll start saving up for one.

 

First take the carb off and measure the diameter of the holes in the intake manifold at the carb flange, and a little ways in.

There's no point in putting a larger carb on if the ports in the manifold are a lot smaller than the throttle bores. You can go with maybe 3-4mm larger on the throttle bores since the throttle blades/shaft take up some of the area in the carb.

If the diameters at the flange and a ways in are about the same, then that'd be your starting point. If the diameter a ways in is smaller, use that. If the flange is smaller, it can be ported out if necessary.

The largest DCOE is a 48mm, if you can find one. There are larger yet sidedrafts (50DCO, 55DCO, 58DCO?) but they don't have choke mechanisms, which is something to keep in mind. A 48 or 50 would be a nice place to start. We're talking bucks, though, so eBay would be your best friend.

 

Yea, a 50DCO is looking at 500$ and a 55 is looking at 550$. At that point I could probably just save my $ and get a holley kit(800$).