This is an eye opening i want to do it...but I can only spend X dollars.
Do some shopping and price out components, add 25% for bits/pieces and issues you won't realize up front.
I did an engine swap first (cost nearly 10K to do correctly) Then did body (8K) then did suspension, wheels and bushings (another 6K)
So pick your battles and priorities.... See what is a must have and a nice to have.
Presently your engine runs? Leave it for now..get the rest of the body operating properly. A fuel injected LS would be fantastic