Rebuilt top end of engine now carb idles much higher?Please help

I had the heads off the engine and when I replaced the timing gears and chain I made sure the timing gears were lined up. The thing is if I remember correctly at #1 TDC the dots on the timing gears were top gear 12 o’clock bottom gear 12 o’clock. So they were in line but not dot to dot. Maybe when I initially pulled the distributor off #6 was at TDC and the dots maybe were right next to each other. That’s when I marked the distributor? When I put the cover back on it lined up at the zero mark when the piston in cylinder one looked to be TDC. Is it possible I dropped the distributor in 180deg out because it was Initially pulled out with #6 TDC? I trying to understand what could of happened.

12 and 12 is correct for power stroke on number one. You line up dot to dot simply for convenient's sake to line the dots up. That's on number 6 power stroke, so, if you want the distributor in correctly with the dot to dot aligned, you drop the distributor in point to number 6 and you're good to go.