I've been trying to get my oil pan to fit my block, I've been testing 2 gasket types (1 piece, and traditional), and 2 oil pans (Original 3 tab and Canton). The original pan and a traditional gasket has been used on this block before, but I had to remove to fix an oil pressure issue. When putting the block back together I noticed that the original pan did not sit flush, it rocked diagonally from passenger side rear, to driver side front by about 1/8th in.. So I tried to gently massage it to fit, and no change. I ordered a new pan and 1 piece gasket. Here's the results of what I've got. Looking for recommendations.

1. Original Pan + Traditional gasket: Rear seal fits tight, but I can slip a .01 gauge between a couple of areas.

2. Original Pan + 1 piece gasket: Rear Seal gap is .022. I can also slip a .01 gauge between several areas. Also, very difficult to get the holes to line up between the pan, gasket, and block.

3. Canton Pan + 1 piece gasket: Rear seal gap is .056. I can visibly see between the rear main cap and gasket. I can also slip a .01 gauge between several areas.

If I use some gasket sealer, (ultra gray, or ultra black), will the original pan and traditional gasket seal?