timing the same for headers set up? lack power?

The slant does not need back pressure. Plenty of folks run straight out the headers at the track.

What it does need is proper scavenging effect. How big are the primaries of your headers? It's possible to go too big and lose velocity of the exhaust gas charge.

Wrap will get some of that back. As the gasses cool, they slow down. Keep the temperature, and therefore the velocity up as long as possible. In effect this causes a low pressure to be present at the exhaust valve, since the gasses have mass. This contributes to drawing charge into the cylinders during the overlap event. A tuned length header with appropriately sized primaries will be very happy. :-D

There are folks running 1bbl setups with headers to good effect, but they've bumped compression. your going to want 9:1 or so to make effective use of them. What carburetor are you using? If it's a Holley, you can bump your jet up a size or three. With headers on a 1920, a 59 to 61 will liven things up a bit. Be careful though, or your economy will tank.
Now that your playing with things, your going to want to work on your distributor. 10 deg initial, a 9R governer, and you might want to put a tad lighter "Light" spring on the mechanical. Just make sure the spring perch is appropriately adjusted to avoid problems with rpm drop going from Park to Drive. If the spring is loose on the perch, you will have to carry a lot of Neutral idle rpm.

Gear ratio and converter stall are also good ways of waking the old girl up.

CJ