Should I use a Classic Update kit or Factory Fit OEM harnesses to re-wire my 1972 Chevelle? My car has HEI and an internally regulated alternator along with an aftermarket tilt column. The difference in price is a consideration for me.

There are a several deciding factors when choosing how to re-wire your car. Today, there are so many choices and it can be confusing. The first thing to do is to decide what your intentions are with the car. Generally speaking, the two choices you are inquiring about are your best bets.

If the modifications you have listed are your only deviations from stock, the right choice would seem to be  OEM harnesses modified for your application (from our Factory Fit line). Items like HEI or MSD ignition, internally regulated or updated type alternators are easy modifications that American Autowire can include  on an otherwise stock harness. In most instances, these updates do carry a modest up-charge fee.
While wiring the car bumper to bumper with the Factory Fit modified OEM harnesses will cost about $250-$300 more than the matching 1970-72 Nova Classic Update kit ($569 retail, check it out here), there may be other things to consider the initial cost.

The first is how the cost is distributed. The great thing about doing an OEM style re-wire is that you can buy the harnesses as you can afford them. This can be helpful when you are on a budget. Just as GM did, we build individual dash, engine, forward lamp, console, rear body, and other harnesses. Because of this, you can buy a dash and console now, the under hood items in a month, and the rear body harness later.

The other aspect is time. With the OEM styled harnesses, the installation time is cut by as much as 50-75%, when compared to a Classic Update kit. This is a huge consideration, especially if you are paying someone else to wire your car. Generally, the OEM harnesses can be done in a day, or about 8-10 hours as they are completely built for you and include every connector, terminal, clamp, or clip so they render a true “plug and play” experience. The kits on the other hand require you to lay out, cut and terminate all but the dash harness. Depending on the complexity of your build and how gutted the car is, 30-40 hours (and sometimes more) is not out of the question. Do the math. If you are paying someone $50/hour and it takes them 30 hours to complete the installation, that’s $1,500.00. The OEM can be done in about 10 hours, or about $500.00. In other words, the extra $300.00 you spend will save you about $700.00 on the back end of the job.

On the other hand, if your car has more than your previously listed modifications or time is less of a factor, the Classic Update kit could still be a valid option.

For an exact quote on your application, I would suggest that you contact our Sales group and explain to them what your planned build is about, and what options you may be adding now or even in the future.  Or, if you would rather get a quote online, try our Factory Fit quote tool here.