I could use your opinion

Let me help ya sway your decision. Stick the 170 back and come up here and get you a 225. It will be very reasonable as you already know.
Small Block
You are on the same page as me Bill, your 64 model 225 will match my trans bushing, The newer models I would have to have the crank drilled for something they call a pilot bushing, and if I recall right that 225 you have has low millage on it and a good shifting standard trans like mine =P~
Your / you have was the one that was on my mind, But I was not sure yet if you was going to build it 8) My pm to you on it must have got lost in the thousands that you get. :-D