318 - New/Old or Hybrid?

I want to get some input into my 68 Barracuda 318 engine build. I bought the car recently (6 wks. ago) and found it has a hole in no. 8 cyl into water jacket. It was bored 0.30 over approx. 15k miles ago. It is equipped w/ Edel. 600cfm carb, performer manifold, stock exh. manifolds, and 1 3/4" dual exhausts.

I opted not to sleeve. Two hundred dollars to sleeve or a 2001 5.2 magnum for $400. I bought the magnum. It came complete w/ wiring harness, alt, ps, AC and PCM. I have the magnum exh. manifolds and new set of Dynamax headers.

Now, I have the best of both worlds? I have the expertise to install the fuel inj. but know it's going to be time consuming. Also, there are a lot of unknowns that I will have to deal with. Sensors and installation, accelerator and kickdown cables, fuel system upgrades, fan and belt, pulleys, etc.

I'm considering old heads/new block, new block and heads w/ air gap manifold, new engine/old pulley system, etc.
Lots of possibilities! I'm anxious to drive the car!

I have been watching the Dart/5.9 magnum installation. I still have a lot of questions. Plus, he has the orig. donor vehicle for those unthought of parts.

Any suggestions? Or advice, that also is welcomed!

Jim