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Are you running FI or carburetors?
Is it the correct Distributor for the engine?
When given BTDC, ATDC, or TDC it is always for # 1 cylinder.
BTDC means before top dead center. You should have been given some degrees like 3 degree, 5 degrees, or etc. BTDC. If there is none then it would be TDC always at # 1 cylinder.
You turn the pulley until the mark on the pulley matches where it should be for BTDC, TDC or ATDC degrees (this is always #1 cylinder).
Then loosen the distributor clamp, hook a test light to #1 terminal on the Dist and one to the ground. Then turn the Dist. left or right until the light just starts to come on. This is static timing and the engine will start find and run good.
However, if you want the best timing, you will use a timing light . You will set the degrees on the light to, in your case, 27 degrees. then run the engine up to the 3500 RPMS. Then turn the dist left or right until the the marks on the pulley and engine match up. The vacuum lines are usually removed from the dist. before timing with the engine running.
If you still have the flat spot and are running FI. Then you have to have the distributor re condition. If you are using carburetors. Then they may need to be matched to the engine with different jets emulation tubes air correction jets and etc.
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