There is no "best harness for a '48". The harness for the guy who wants to show his at VCCA events won't do for the guy who has a V8, power windows, A/C, etc. What you need is probably somewhere in between.
The cloth covered wire is what you want if you are going for a 100 point restoration. But it seems to me you said in the other post you have a 12V system. Therefore there is no need for the extra expense of the cloth covered harness. If your truck is basically stock, not a bunch of accessories, I'd recommend the replacement harness from
Classic Parts , formerly Chevy Duty. This harness is made to fit and has all the terminals installed.
If you have no experience at wiring you should shy away from building your own. If you need a harness with extra circuits use one of the after market harnesses. You'll have to cut to length and install terminals but it will be a good experience. I'd recommend
Hod Rod Wires. They are less expensive than the others but are not cheap. The wires are heavier than stock. (8 ga. hot wire and alternator, 12 ga headlights, etc.) When you have a problem you can talk to the owner on the phone.
