Pull the entire front clip off the Model A, hopefully you got the front frame with the suspension from the firewall forward off your donor car. You will need this piece to copy the suspension mounts and adapt to your frame. The rest is just fabricating the custom mount to your frame. Machined out of solid mild steel is your best bet, mirror imaging the other side is easiest this way. it will be expensive unless you have the knowledge and skill to machine these yourself.
Your best bet if you don't would be to take the entire car and donor suspension to a chassis fabricator to have the pieces fitted. Needless to say you would need a well outfitted machine shop in your garage to pull this off yourself. Mounts for the rack etc. etc. will all have to be made as well as numerous other pieces to numerous to mention.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”
— Han Solo