Slant Six Dead Spot

You need to figure out the timing first.

The first thing you need to do is chuck the OSAC and don't look back. Hooking it up backwards is not going to do anything but temporarily relieve your problem...while causing others. Your distributor line should be connected straight to your carb with nothing in between.

If you can't get your timing to go down to TDC to 10* BTDC, then you need to adjust the bracket on the underside of the distributor. Loosen the bolt and turn the bracket an inch or so and then reinstall the distributor. That should get your timing back in the 0-15* BTDC range.

If you still have the problem then at least you know you have your timing in order and one less thing to worry about.