1980 f350 351m motorcraft 2150 (d5tebma)

hello all am new to the forum and am just startn to find my way around, found some good info and diagrams and thank all who posted them, a couple things i didn't see anywhere was:::
what vacuum port to plug the choke pulloff into????

i imagin it needs full manifold vacuume but wanted to check and see before i plugged it in
i just got done adjusting the choke i had a fire(accelerator pump shot gas at the dist cap, replaced pump) and melted the old one so just got another on there. i dont know the factory spec for this carb as i dnt have a kit for it so i set the pulloff clearence to about 7\64 with a drill bit of that size, just need to put vacume to it now

any advice on this carb and setup would be greatly appretiated
thankyou