Put in Comp 268 a good set of headers and a LD 340 intake or equiv. get the dist set to near as can 44 total depends on actual comp you may only get42total run a 650 Dbl pumper or 750dbl pumper jet the 650 67-74 + or minus 2 jet sizes depending on temp The 750 is a little more finicky as it is too big for that enginein that size car Would work great in your Dart. Use 71 and 77 rear jets there agan only +1 jet size or so to temp and run a 31 squirter in the frt and 28 back. Keep it at 180 and run at least a 3.55 gear or short tires with a 3.23 and you will have a low to mid 14 sec car that will run on mid regular