Help 79 c10 build

[c10Sleeper]

Hi i have a 79 c10 custom deluxe i just bought a few weeks ago ive been looking at parts and done research im going to buy a blueprint 355 crate from summitracing and i wanted to put it with a th350 but i dont know what wiringharness to get i think the painless would work but im new to this. I plan to pay to get them swapped when i got all 3 and a new tach. Please if you know links would be good or if yall have a better setup in mind let me know with links it needs to be engine 350~400 hp, trans, harness
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