Getting something on to the driver-side exhaust flange is gonna be the make or break part of this build. Many BB/ Early-A projects get this far, then stall for lack of exhaust. I once, in about 1976, was given such a project for this very reason. The car was a beautiful 66 Barracuda, and the owner just wanted it out of his sight. I was barely 23 years old, and like the idiot-kid I was, I treated it as a parts car. Alas, alas, Woe is me.
Back then there were only two options for exhaust; the factory Second-Generation BB log-manifolds, or Hooker fenderwells. IDK about today.
---------------------------------------
I sold the parts and soon purchased an already hot-rodded 1974 Dart-Sport 360/4-speed that had a brand new paint job and monster tires on it; from another kid, that just got married with a baby on the way. IIRC I paid $2000 for that car and it was worth many times that much in terms of FUN!, lol.
I got married in 77, and bought a house in 78, and soon after, I had sold that car for a tidy profit. ....... I was driving my First Second-gen Barracuda, a 69 slanty automatic.... in preparation for, you guessed it, by fall of 79, my new bride started carrying a little extra weight....... which soon turned into the first of three children, this one being a beautiful baby girl; my Hot-Rod life was over....... until about 20 years later.
I recently turned 70, and that was going on 50 years ago so the details are fading, please forgive me if I made an error..... lol.
