I know how you feel It took me about 2 months to change from a 396 to a tall deck 598. Nothing lined up bolted on or fit quite right. The biggest problem I had was the march surpentine pullies that was bought for ease of installation and so I didn't through belts anymore not for looks. I had too buy additional parts to make the altenator bolt up and march told me it was designed for 69 camaro power steering pump.when it said big block chevy.not 69 bbc . Bought a new pump and still had to grind on the the pump grind on the billet bracket and add washers and still didn't get full adjustment of the belts.