Most of the 1.9 intermediate shaft pulleys have the holes the same as the 1.6 pulleys and look much like the 1.6 pulleys. If it has an 068 part number it is the 1.6 pulley and should be replaced with the correct one.
Don't worry about the power boost. Putting studs on makes doing any work on that head so much better in the future and will help seal a regular gasket much better than the standard method using head bolts. Spend the money now and you can sleep easier after the rebuild. Turbo later? Not a problem.