Aftermarket alternator mounting bracket for 1970 340

Post the depth of your pulleys. Cast or alum w/p? Cast one is 2 1/4 approximately. Alum is 3 in. About the same depth on the crank if u have a p/s 2 grove pulley. Kim
Crankshaft belt center to damper face is 2 inches. Water pump is cast alum. WP pully extends out past damper by 1/4 inch.