Help appreciated

I recently purchased a 73 Plymouth Scamp. Solid car with no rust. Has the leaning tower of power in it currently. I am picking up my dana 60 with a 4.10 posi with 35 spline axles tomorrow. Which also comes with rear disk brakes. Excited! Arranging to get my leaf springs relocated within the next few weeks. I am going to be sporting the 225cid. until I get my motor and trans complete. Still don't know if I am going big block or small block. More than likely big block. Was doing some research and found this site. Gotta love the internet! Looking forward to reading the inquires here and learning some knowledge. Any info would be greatly appreciated.