Hotrod Lincoln, you made me think of the first engine I rebuilt. A 1962 Austin Healey Sprite with the 1 Liter engine. Dual SU carburetors. I bought a Uni-Syn to try to get them close, and it ran fine, but I didn't have any confidence, so I took it to a dealership to have it done by a professional.
About 3 months later one cylinder quit firing. It was in the middle of a trip so I kept on trucking and it was running on 2 1/2 by the end of the trip. So I popped the cylinder off and noticed that the #4 exhaust valve was missing at least 1/3 of it's skirt, and #3 wasn't much better.
Those were sodium filled valves and I think they cost about $16 apiece. Big bucks for a poor college student in 1973.
When I checked the carbs I found out that the had been adjusted so that the front SU had to open to 2/3 before the rear carb started opening. I have no idea how they did that, but I never let anyone else adjust them after that. It ran fine for years, and got nearly 40 mpg on occasion.
