PAINLESS WIRE HARNESS (thoughts)

Hi everyone. Was hoping I could get some opinions or any previous experiences on this new harness I just purchased from summit. (Painless Performance 21 Circuit Mopar Color Coded Harness #10127) So I trashed my whole original harness from my stock 73 dart with a 318. It was melted all over the place with loose wires from front to back. I will be installing an edelbrock 4 barrel carb...edelbrock manifold...msd ignition..mini starter...Currently have Flow Master 40s installed..and i believe Flowtech long tube headers installed..got new KB Pistons..and just had my block honed out .30 over..here is a pic of the little accessories I'm putting plus the harness I bought. Guess my question would be is if this harness is the perfect fit before I open it when it arrives?... Luv you all TTFN..

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