I have a 1974 duster same stock engine from the factor only thing I've ever replaced is the water pump ?

It will run 12.97 consistently in a quarter it has a one barrell carb. On it I'm looking for a huge upgrade hoping to go for the blower look I already have a huge hood scoop on it so a hole won't be a problem I'm also looking for some horse power ideas just something to get me faster any suggestions preferably keeping it within 5 g's