Advice on Wilwood disc brake

Thank for all the advice here it is great and has me thinking.
Yes I agree 4.5 would be best to have but its cost for buying and importing to England would be large.
There is not much here to have and to buy new it is only in US.
for this reason (cost) only the decision is harder, if I was in US then I would change it to 4.5 wheels front and back.

So what would you say about using this:

1960-72 Dodge, Plymouth "A" body, with 9" drums Wheel Kit

Has anyone used this, is it a good product.

Thank you guys.