Alternator belt trouble

[pdawg]

I installed a ZZ383 crate engine in my 1972 Chev C10 Custom Deluxe & used the factory power steering & alternator brackets. I dressed it up with some GMPP valve covers. My problem is a lack of adjustment on the alternator belt. I had to go with a longer belt to clear the covers but it's at that point where any further adjustment actually loosens the belt. My son is having the same problem on his 1977 Corvette after installing similar GMPP valve covers. Any suggestions would be greatly appreciated!
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