I have a 73 dart sport with a 340. It doesn't have the factory J heads on it just the regular heads with the smaller valves. What would be the best bang for the buck?? Rebuild current heads,have them made to the same specs as J heads,or buy new edelbrock? It has a mild cam,headers,600 cfm edelbrock carb,the orange electric box,4 speed trany,and 4.11rear gears. Thanks

 

no it's the stock rear end. diffrent gear ratio.