Ive woken a number of 318s up with nothing more than stock 340/360 parts.
360 heads w/ port match (may need milling depending yr for compression ratio), 340 manifolds, AVS / edelbrock carb, 340 cam works wonderfully in this combo. Mopar perf ignition w/ orange box is tried and true.
Nothing fancy or overly hard to come by and all can be made to look bone stock to the casual/ untrained eye which may be important, idk.
3:55 gear with most passenger car 15" tire sizing is about as middle perfect as you can get for what you are discribing, if one can be had in the 8 1/4 diff.
