My personal preference for harnesses is Speartech. Always excellent work and they will build the harness exactly how you want it.
(distance from engine to ECU), do you want a/c request/pressure sensors, auto or manual trans.
The Speartech harness is lays out nicer in the engine compartment (IMO) and also the fuse box included with the GMPP harness is on the large side so harder to manage a clean install.
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69 Charger. 438ci Gen2 hemi. Flex fuel. Holley HP efi. 650rwhp @7250 510rwtq @5700. 95 F355. 96 Carrera 4S. 59 Cadillac series 62 convertible.
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