Ford 4.9 question. Yes ford question

I wasn't sure if the pulleys would interchange with older ones.

Would I need a new altenanator or can I change the pulley?

I'm thinking a 78 or 9 ish 4.9 would have the v belt pulleys and brackets.

I need to get rid of the current altenanator bracket because it's the one piece altenanator/ smog pump bracket.

I want it to look clean and stock even though it isn't
You likely will need an earlier alternator. Plus of course the alternator brackets, and water pump and crankshaft V belt pulleys. You'll also need another water pump, as the one you have now spins counter clockwise.