On the sheet that comees with a Dart block it tells you the GM bolts are too long. It says the two oil filter adapter attaching bolts should be 1 1/4 (1.250) O.A. length. This will allow 1/2" (.500) of thread into the block. This is SHORTER than the stock Chevrolet bolts. THIS MUST BE ADHERED TO. The engine builder shouldhae noticed this.
Steve