Here is another twister for you guys. My 66 came with a 318 but the owner i got it from had put a 440 in it. I recently had to replace the water pump and found someone had used nuts between the pulley and the pump as shims. In the process I changed the Power steering pump to a Saginaw because I thought it would correct the belt alignment and improve steering. I look like the Guy who did the engine swap used the parts from the 318. The 440 is a 1970 block and has a 4 grove crank pulley. We will have to rebuild in the near future so a serpentine system will be going on. S5757s hope your pulley at least works for you. Keeping the belt on this thing will be a problem, any suggestion will be appreciated.