Very good advice Dave...fact is that if your going to own and operate a "ancient"car like these at this point, you either have will have to find a competent mechanic with D-Jet experience (and when you do, hold him close to your heart)...and you'll of course have to pay for what they do (compared to a modern mechanic who will be lost as soon as there's no diagnostic port for him to plug into, but you'll still play plenty to him too) OR become competent to some at least some extent yourself (be it on SU Carbs or your own D-Jet, even if you're not electronically qualified).
Point is that owning a vintage car takes a certain amount of commitment and input, either money or time, or both at first or if you're unlucky...if you're not ready to give that, or you were under the misconception that it wouldn't take that, you need to adjust your outlook on things, or maybe owning a vintage car is not for you...and you will resign yourself to being an appliance operator who drives something everybody else drives, with a diagnostic port.

Cheers