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Do This FIRST
Stick with the Zeniths. They can be made to work and work well. Do you have diagrams for all the vacuum do-dads?
Also, DON'T balance the carbs, until you have gotten the ignition to spec, the valve clearances to spec and the gas tank at least half full of quality petrol.
Follow the specs for the '72 engine....
1972 250/8:
Distributor: 0 231 142 005
Dwell: 30-36 degrees (new points should be at 36)
Firing SET point at 800 RPM WITH vacuum: 4 degrees ATDC
TEST point at idle (800 rpm) W/ vacuum: 1 ATDC to 7 BTDC
TEST point at 1500 rpm W/ vacuum: 42-50
TEST point at 3000 rpm W/ vacuum: 46-54
TEST point at 4500 rpm W/ vacuum: 8-12
AFTER you have adjusted the valve clearances on the cold engine, THEN warm the car up with a short, easy drive, and set the DWELL and Firing point. When you test the dwell, the maximum allowable deviation from 800 RPM and 3000 RPM is 3 degrees. More than that, and you'll have to send it to William Durrance for a rebuild. Also, the various ignition values presume that you still have the transistorized system installed and that it is working OK.
-CTH
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