What to do for 5.3L harness and ecu

[68Redhead]

Hi folks, I've got a 5.3L engine with a cut up harness and no ecm and im looking for advice on which route to go for getting a harness. It's got a cable throttle body on it and I plan to put a 4L60E or 65E when it's time to do the swap. I've found a harness and ECM from Painless but it costs $1,100, surely there's a cheaper alternative. Just looking to see what's out there, I want to rebuild the 5.3 and trans before installing so I'm kind of turned off on the idea of getting aided harness from a yard unless you guys think it'd be fine. Any help/advice is greatly appreciated!
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