Wire harness pass-thru

[scoutcamper]

Hey Everyone,

Finishing up installing my TPI into my dads 1965 C10(family hot rod!). I am now onto wiring harness. I used the stock wiring harness from a 1991 chevy Camaro, and as such it is very long. I was thinking about bringing it along the passenger side frame rail and then punching a hole under the seat, mounting the ecm there.

What I am looking for is: passthrough options. I want something waterproof because the hot rod does get driven in the rain occasionally.

Alternatively I was thinking about running the harness into the old clutch hole, but that exposes the harness and I am going for the hidden wire look here


Thoughts? Other Suggestions? Feedback of some kind?

Thanks!
Scoutcamper