Best cam choice?

68 440,stock heads,wiend dual plane,2500 converter,800 holly,schumacher tri-y headers,391 gears, in a Dart,want to do some nostalgia drags,can anyone recomend a good cam ,I dont want to have to change valve springs
It has a comp cams 268h-10 and its very mild (268 duration/ .454 single grind)