At the bottom is what www.msdignition.com
has to say about probably their whole ignition system trouble shooting. I'd say if those wires are solid wires not carbon or whatever is required for the hot spark... one oops. I'd call their hot line. (915) 855-7123
MSD TECH LINES are open Monday thru Friday from 8am to 5pm Mountain Standard Time. The last issue I was posting as a possible solution to a guy a little while ago. I think it's ford who has a spacer if left out you get the cam walk. Never thought of it as being tell tale by a bowed out timing chain cover. BFH right hehehe. Anyway I read some place about a guy having a problem with some spark plugs not performing till up to temp. I'm not sure but it appears the manufacturers idea is multiple pulse sparks for fuel ignition so maybe the speed the coil drumps it's voltage isn't fast enough with other stock parts. I'd be more prone to think the high voltage is swamping the rest of the system out like a tesla coil. One of my worst experiances is to not check the ground quality. You can have a ton of voltage but if the ground aint in there good the flow sucks. Namely one set of points and condenser forgotten to be screwed down tight while and after adjusting. I had to finally stand there thinking and figured it out. Good luck.
Here's the manufaturers comments.
What kind of timing light are you using? Many lights have trouble reading the MSD's capacitive discharge multiple sparks. Dial back timing lights are not recommended. Try another non-adjustable light and check the timing again. MSD offers a Timing Light, PN 8990.
Make sure you are not using Solid Core wires.
Inspect the routing of the Magnetic Pickup Harness. It should be routed clear of the coil primary wires and plug wires. It is best to route it along a ground plain such as the firewall, frame or engine block to form a shield around it.
Check the polarity of the magnetic pickup wires of the distributor. Reverse the connectors and check the timing again. The correct polarity is whichever connection gives the most retarded timing.
On Chevrolet engines, if the timing is retarding 10 - 20 degrees inspect for cam-walk. This is especially prevalent on engines with a chrome or stock timing chain cover that is actually bowing forward allowing the cam to "walk".