There's a couple other ways out, if it's not a show car. I think Mallory still has a tach drive dizzy. It's expensive, and will require a new tach drive cable from the looks of it. No vacumn advance, so cruising milage will suffer.
I ran a 55 tach drive for years, using a modern carb. The dizzy advance was timed in and an MSD6AL unit with a timing computer hidden under the dash. It wasn't an optimal solution, as the computer would only allow 20* of retard, so with 10-12 initial, you were a bit short on total timing. I fitted a modern vacumn can, so I had more advance under cruise. But it worked pretty well, and since it was a blower motor, I also had boost retard. These days, maybe better more flexible computers are available.
Frankly, I wish I had just bit the bullet, and paid for a good OEM unit. If you want more info, send me a pm.
Miker
South and east of Seattle.
