We have put together a dipole, each leg is 66 feet.

Bob-

The feedpoint of a halfwave dipole in free space is about 72 Ohms, which would
result in 1.44 to 1 SWR. A real-world dipole sill be a little different, and
it might be possible to trim it close to 1 to 1.

Your dipole is about halfwave on the 80m band, so it should work there.
However, it is a full wave on the 40m band, two waves on 20m, three waves on
15m, 4 waves on 10m. The input of a full wave antenna (and presumably
multiples of a full wave) is extremely high. It might be higher than your
tuner can match.

The best transmission line may be some kind of balanced open wire feeder, but
you still would have a high impedance to match. One of the old Viking Matchbox
tuners may be capable of matching it without using a BalUn, but changing to a
balance feedline might be all you need to do.

Another alternative is to use a "Trap Dipole" that has parallel-tuned traps at
the ends of the 40m sections. Such a dipole is often shorter on 80m due to the
trap's inductive loading. There are some versions that may have additional
traps for higher frequencies, but just adding the 40m set may make it tuneable
on the other bands. I have one with just the 40m traps that came with a balun
in the center, that worked "OK" on 80m through 10m using a tuner. (It is
twenty years old now, so may not be working as well as it used to.)

73, Fred, K4DII