Stock 318 bolt on performance modifications

Sounds like you want some simple bolt on mods and nothing too fancy. My brother and I did the same with a low mileage 68 Charger that came with a 318 2bl. We changed it to a 4bl intake (be careful dropping it in place. if you "pinch" the gasket moving it around, it will leak...I made that mistake), a 600 cfm carb, hotter than stock cam, headers, and low restriction muffler. It had stock 318 heads and no other work was done. It ran good and fast and fooled a lot of people who swore it had a big block.
I forgot to add that modifications had to be made to make the throttle linkage work. It was a 3 on a tree so not as much work as if it had been an auto trans.