Is the a/c compressor installed? THat will make a huge difference. With the a/c compressor installed the crank pulley should have 4 grooves. 2 grooves for the a/c compressor and alternator, 1 groove for the power steering pump, and the last groove is for the water pump and idler pulley. If there is no compressor, then the crank pulley will have 2 grooves, ans the water pump pulley will be deeper than the a/c water pump pulley. There will be 2 fan belts in that situation, 1 for the power steering and one for the alternator and water pump. I understand the problems youa re experiencing with the local auto parts stores. Mine don't even have a listing for cudas with anything larger than a 383 in their system, and then they argue with me about it, when I have the car sitting in their parking lot. Hope this helps.