You can use most of the Van stuff you mentioned. The front axle is an easy swap, ditch the twin parallel springs and mount the axle using a transverse spring just like on any hot Rod set-up. All of the mounts and brackets are very easy to fab yourself or if need be they are available from at least half a dozen suppliers. The Van rear 9" is probably to wide for a model A. My Model A uses a Jag rear suspension and I had to narrow it when I replaced the narrowed 9" that was in there for years. Thats no big deal either, narrowing is no big deal, but if you look around there are some narrow enough fpr your A. The 302 is a no brainer, simply to swap into a Model A and provide plenty of power stock for such a light little car. They dress up OK as well if you are into Ford motors.

So of the three things you mention Front Axle--- Rear Axle----and engine choice, all can be made to wpork pretty easy and all will provide good service in your little Hot Rod Project. Get to cutting!!

Roland