1968 mustang 289

Hey guys i currently have a pretty much stock 289 68 mustang coupe. it has an edelbrock performer intake, 1" spacer, edelbrock 650cfm 4 barrel carb, tri-y long tube heads and 2.5" dual exhaust with an h pipe. Im looking for that lumpy idle those thumpr cams give. Although I dont know of a good matching set of heads to pair with the cam. I dont race doen the 1/4 mile. I just want to sound great during car meets and put a bit more power under the hood. Does anyone have any suggestions of combonations of heads AND cam under 2000? thanks