None of the above.

The "best" way to match the look of vintage wheels on a vintage bike? Pick up a set of vintage wheels.

Your bike is 40 years old, why not pick up a set of nice, USED wheels. In over 500 bikes rehabbed, and dozens of wheelsets replaced, I have yet to have bought a new wheel. Sure, its going to happen eventually, but I have a couple of year supply on hand right now.

Used 27 inch wheels can be found in the $20 to $40 range, used usually include "extras" like skewers, tires, tubes, rim strips, freewheel or cassette. Used 700s a tad higher, more like $50+/-. Note, I have found a lot of wheels for less.

Last wheelset I picked up was about a month ago, a nice set of 27 inch wheels, came off a Cannondale touring bike. Came with nice Michelin tires. Seller also included FOUR brand new Michelin tires. $30 for the lot. Did I scoop them? No, they sat on Craigs List for several days.

Some of my wheels have come in the form of a complete bike. The bike may have had frame issues or whatever.

I picked up a set of 27 Weinmann concaves, as recommended by Auchen above. They came on a bike, with frame issues. Bought the bike for $30. Besides the wheels, it had good bars and stem, good seat post, good vintage Apex crankset (I needed it for another build), good FD, etc.

Use some of the savings and buy a digital caliper. Harbor Freight has their nicer $30 version on sale for $10.99 right now. Be sure to go to slickdeals, and download a coupon for a free item as well.