[piecesparts]

I would definitely RE-approach your timing. FIRST, did you set the timing with the vacuum hose removed from the distributor? (I am not saying you did wrong--just checking know how here) Second, you apparently set the timing with an ADVANCE type timing light to get the 33 degrees. What you are shooting for here is a TOTAL advance of around 35 degrees. Which when you disconnect the vacuum hose the initial timing will settle in around 15 to 22 degrees on the timing marks. You also want to set this timing with the engine RPMS where the distributor is at a speed to be fully advanced for the setting of TOTAL advance timing. That is where I would start.