1975 Dart 318 (sorry but it's a4 door) Just want to say THANKS in advance the help!!

Okay guys here is where I am. 1975 318 dart- here's what I have done.
Hedman headers into 2 1/2" exhaust
Weiand Action Plus Intake
600 Holley carb

Doing cam, lifters, and timing set next. Suggestions Please!?!?