It was running ok, now it’s terrible, I need help!!!

If the damper slipped once and you had to re mark it, it has probably slipped again.
Verify TDC using your piston stop again. And look into either having your damper re built or replaced.
A company named Damper Dudes does a nice job on rebuilding dampers.
You should also do a compression check. The valves may be shot and not sealing well. Worn guides, weak valve springs are another possibility.
Have you adjusted the valves and checked for gunk under the valve cover. If the engine has never been gone through there may be a lot of sludge under the valve cover limiting oil to the rockers and valves.
With the engine running and a timing light on #1 spark plug, how stable is the timing light flash? At idle and at higher RPM’s? If the timing light flash is jumping around, possibly a worn timing chain or a worn distributor. With the timing light you should also be able to see the mechanical distributor advance come in, maybe from 2000 rpm and up. If the mechanical advance in the distributor is not working engine power will be down and being real late it could fire out the exhaust at higher rpm’s.
Check those items and let us know what you find.