Engine set up

It want's big initial, just have to limit mech, in the dist. I bought a Mallory, and it is fairly simple, they even include spacers, to set total.
If I set mine below 18, it will just slowly die (8 vacuum, with 2.5 powervalve.) 650 carb.

what do you mean limit the initial? this is changing the springs in the distributor?

it starts ok at about 950 rpms, but I'm getting a bit of a stumble or rough idle occasionally,i must be at least 30 degrees advanced the timing the mark is under the water pump so i need to get timing tape since my light does not have advance feature.