Hi Mark, as with any project I would suggest that you do your research and have yourself a plan and budget to work to.
Before you know it a build will spiral out of control so spend every penny wisely.
Once I decided on the engine I wanted, I used this forum to see what others had used before me as a guide using the vast knowledge available on here.
I used many parts from Retroford who know these conversations inside out and used there package as a guide sourcing cheaper and alternative bits and pieces along the way.
good luck π