Colin, the main thing to check is whether it is a clockwise or anti-clockwise unit.
The A7 is anti-clockwise (n.b. this is defined by Lucas as viewed FROM BELOW); you won't get far with a clockwise unit (unless you find an anti-clock spindle assy for it).
Advance degrees can be reduced by a spot of weld on the action plate and some deft filing (i.e. slightly reduce the size of the hole on the outboard side). It needs of course the unit stripped first and some careful measurement to ensure the right advance results. It is within the capability of anyone with a MIG welder, a file and a DTI (or a protractor at a pinch).
The advance springs may not be ideal, but they are most likely 'tired' anyway and although excruciatingly expensive the 'Distributor Doctor' can supply them.
The other issue you may face is the drive gear & its position on the shaft vertically. With care you can rotate 90 degrees and drill a new locating pin hole through the hole in the drive gear. It should be firmly held against the body while doing so (n.b. with a fibre washer between). If fitting a new gear be careful where you buy it from as several here have had bad experiences. I believe those sold by our A7 specialists are fine.
edit: Beat me to it John! But I agree...
The A7 is anti-clockwise (n.b. this is defined by Lucas as viewed FROM BELOW); you won't get far with a clockwise unit (unless you find an anti-clock spindle assy for it).
Advance degrees can be reduced by a spot of weld on the action plate and some deft filing (i.e. slightly reduce the size of the hole on the outboard side). It needs of course the unit stripped first and some careful measurement to ensure the right advance results. It is within the capability of anyone with a MIG welder, a file and a DTI (or a protractor at a pinch).
The advance springs may not be ideal, but they are most likely 'tired' anyway and although excruciatingly expensive the 'Distributor Doctor' can supply them.
The other issue you may face is the drive gear & its position on the shaft vertically. With care you can rotate 90 degrees and drill a new locating pin hole through the hole in the drive gear. It should be firmly held against the body while doing so (n.b. with a fibre washer between). If fitting a new gear be careful where you buy it from as several here have had bad experiences. I believe those sold by our A7 specialists are fine.
edit: Beat me to it John! But I agree...