Windsor 351 Distributor Problem

[RedXT]

I have a 351 F4TE block converted back to carbie and have been running



It runs fine but I have 44deg total timing at 3300rpm not so good.

I replaced it with this



Adjustable etc and was running ok with 14deg initial timing and 32 total timing at 2800rpm.

After a couple of short runs the motor was not normal and after checking the timing it was all over the place, usually at start it was slower at idle and had 0deg timing, rev it up then at idle it would speed up and have 15deg timing but even if u went to 2000rpm it still only 15deg timing. Turn it off and start again same thing. so I pulled the disy out again and found marking on gears as per pic

It appears the gears are not meshing properly and binding causing timing issues. After comparing measurements I found the shaft size below the gear was 515thou on the first disy but only 500thou on the second disy

My question is and from what information I have found is that windsor blocks up to 1982 had the 500thou disy base and EFI blocks from 1983 went to 531thou.

Does anyone have any recommendations on an adjustable disy or somewhere I can get the first on remapped

Thanks Thomo