Interior Question - 74 Gold Duster

Hi everyone! Hope you are all having a great weekend, so far. I have a couple questions for the masses. First, I am buying a 74 Gold Duster that needs a complete interior. I may be able to salvage the carpet and bench seats (need recovering), but thats about it. I will need everything else. Should I begin looking for a complete used interior or would I be better off to buy new repop (like Legendary)? Also need tips on giving a tired 318 a boost. It is a stock 2 bbl 318 w/ a 904 tranny. It does have dual exhaust, but thats about all the upgrades it has. Thanks -[/QUOTE]