Ok fellas...318 help needed , Mpg , reliability and enough power ***for a big boat !!!

Ok ! Sooooo i bought the famous street sleepy Fury , it has a 318 ( not match ) from a 72 scamp+ a 904 , all stock, i have a A999 with a 2800 stall or a nv3500 out of a 5.2 magnum or leave the stock 904 there , 2nd i have a 489 case with sgrip 3.23 for it too , the famous question here , alway had 360s and 340s , but always heard the a 318 is a gem if done correctly , porting stocks heads ? Headers , 4bbl intake and carb, small 440ishh cam ? Let the 2bbl there ?put a dual exhaust , bla bl bla , I dont want a superstock set up , my duster is fun with its 400hp crate..but the big fury needs something respectable to have a bit of sound , performance and at least a bit of economy , not swapping to a big block ahahahah , what would be your set up if it was yours ? Thats the big question to answer !!! *** i have a 5.2 and a 5.9 magnum in the corner of my storage unit..but would love to leave this old LA in there and work it out

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Makes no difference to me what you do but that thing is bad assed!!!!

If it was mine and it ran I’d tune it up real good, wash it down and drive the hell right out of that thing.

Very VERY cool car.