First off welcome to CHR Mate! I didn't choose to have a budget, I decide where I would spend my money as I went, still going. I want what I want, and was/am willing to wait for it if I have to. I do agree with rspears (Roger), changing direction and changes eat up funds and time. I have also spent an equal amount on tools. Probably a good 10K worth just to support my habit. In my experience so far, parts selection has put a small damper in my purchases. I even consulted companies before my purchases, but they were wrong. Example, coilovers and sway bars, so far. There is no way to know exactly what you will need when you are building a car for the first time unless you are building a cookie cutter mail order car. Like Roger, I too had a plan for the engine, but like all goods plans, that got thrown out the window. My rodding buddy found an Aluminum Rodeck 350+ Racing Block. Then it was cubic dollars to build, and it backed me up several years to save up and purchase all the parts. I would say it is all worth it. You will work and work and work and seem like you are getting no where, then all the sudden a major leap forward. The best day will be the first drive no matter how short or long it will be. If you get stuck, just ask us here, you will get many answers and advice from people that have been there.

Have fun, plan a little and build a lot!

Good luck!

Keith