You guys are bad.
The upper scroll seal needs to be within several thousands to the crankshaft,hot. Now to get it this close is kind of trickie. If you remember this is a peice of cast iron shaped like a "U". Useing a peice of glass and a very fine peice of sand paper sand the legs of the U till they are clear bright, should take maybe a dozen or so strokes, maybe as much as two dozen.
Now for the intresting part the holes, three of them for the bolts holding the seal to the block are just a bit larger than the bolts. Useing a large clamp made for wood working, after the bolts are in snugly but not tight, pull the seal down to the crank shaft, tighten bolts, safty wire. Hopefully you have not gotten it to tight but then if it is a real leaker this should not be too much.
Of course you understand that the bearing blocks including the upper scroll seal were line bored when the enging was manufactured. Over the years with rebuilds etc the crank wore a bit as well as the seal, or was polished by the rebuilder destroying the scroll seal tolerance. You know darn well it did not leak from the factory.
Don't forget a new gasket is cheep insurance. Make one from a heavy paper bag.