Re: 69 Torino Cobra 428CJ
1 - Where are the two idle a/f mixture screws set? They should end up around 1 1/8 turns out at best idle and set the same. Ending up somewhere else or not having an effect is an indicator of a vacuum leak.
2 - Is the ported vacuum that feeds the distributor alive at idle? It should be dead at idle. If it has vacuum, the primary plates are too far open, which could be because the secondary idle is closed too much, or it could be that it has a vacuum leak and the idle has to be opened too far to compensate
3 - Have you tried letting it idle with the vac advance unhooked? Some Ford distributors end up with a worn pigtail to the points, at some locations of the distributor pla6te, the wire can break contact or short out. Not common. In addition, if this helps and the vacuum is alive at idle, it may just be tuning or again it could be a vacuum leak
4 - Finally, see if he can find out if they used Felpro Printoseal intake gaskets. They do not work well on an FE
It of course could be a wiped cam, hopefully not
70 Sportsroof, 427 FE/489 cid, TKO-600, 31 spline 4.10, A/C. modified Mass-flo EFI/CnC ported Victor.