[bluejimmy76]

you should have the dist vac advance to ported vacuum. at idle it sounds like you have it at like 25 or so degrees. thats too much. Does it grunt when you try to start it? you should get a timing light with an advance dial so you can see how much you have in timing. check the total advance, time it at 3000 and idle, write the two numbers down and subtract, thats your total advance. Example: at 3000 its 32 deg.
at idle its 22 deg. Thats 10 deg of total advance, with the vacuum advance hose off.
To get the idle timing lower without sacrificing total advance youre gonna have to recurve the dist. widen the advance curve. My 406 race engine has 38 deg total advance at 3000. its a crank trigger set up so its locked out but my msd retard module helps when It cranks the timing is retarded 20 deg.
That 268 cam is awesome! I had it in a 355 and I set up the dist to have 12-15 deg total advance, set the idle timing at 15-17 deg at 800 RPM and depending on the gas I ran 27-32 deg at 3000.