[elmariachi]

The OP wrote "what companies you would recommend to use to buy a kit from. I am looking to start the build in the spring." Superformance, Backdraft and Kirkham's are not kits that an owner builds, they are completed rollers.

If you want to build a car yourself from the ground up and you want an inclusive offering, Hurricane, Factory Five and several others offer turn-key kits that include everything you need less powertrain, tires, paint. Plenty of other kit builders out there depending upon your budget and preference.

Do your homework, look at cars in person and talk to owners. The points made above are valid...you can spend $5k just chasing bolts, bit-parts and fittings if the kit doesn't include them. Shortlist your contenders, talk to or visit the companies, get a bill of materials from each and build a spreadsheet for yourself from which to make a decision. You'll be less likely to be disappointed later, as MANY are after buying the wrong kit.