250 ported or unported vacuum, timing

[vasquezmrysvll]

im about to start tuning my 250, i need to know if the vac advance for the hei needs to be ported or manifold vacuum? also need to know the same for the vac modulator. i rebuilt the carb and i still get the same stumble even the occasional pop when i snap the throttle. my timing tab is there but the digits are unreadable, does anyone have a readable pic of there timing tab? thanks