Technical Frame mount brake booster

Need some recommendations/advice here. I plan on installing a frame mounted brakebooster/master cylinder on my '37 Dodge Truck restomod. I need some help on finding the right type of Brakebooster it. I have disc brakes all around, using a jag rear end with a mustang II IFS/11" big brake setup in the front. Ive seen several brake booster sizes (7", 8" 9", single or dual diaphragm). With the setup mentioned above, what'll be the best brakebooster for my truck?

Thanks!