Front Crank Seal

Finally fired up my expensive "pro" built 1275 last night, what a
thrill!  However that thrill was quickly diminished by a rather large
flow of nice new oil  running all over my garage floor, coming from the
front seal on the timing cover!  Now I did slightly overfill the oil
capacity by mayby 1/4 of a quart, and I have heard that overfilling can
blow out seals. Anyone with this experience? or should I blame the
builder?

Cheers!

David