80 dual Vbelt alt pulley on my Buick V8

[Gumby]

80 dual Vbelt alt pulley on my Buick V8

If I put on two belts like it had stock, it squeals all the time, if I just have on one belt, it will only squeal on take off for a sec or two.

Both annoying

All looks linned up proper, tight as can be, tired of the noise peroid;
and having to turn off say like the heater fan before I take off at night with lights on so it does make noise.

Anyone ever run into this???