Yet another 273 build advice thread!

Reading threw this thread in gotta say you guys really know your stuff, and I'm have to really think to follow along so thanks for helping the learning curve. What I can add not sure if it helps but the 273 I pulled out of my 64 had a stock 340 cam installed by my dad in the 80's I don't know what particular 340 cam but I do know that thing idled like it was a huge cam and power was way up in the rpm band.