318 magnum VS 318 roller VS older 318 gas mileage

Agreed. I found prices all over the board when I went looking for an engine.
I ended up paying $350 for it. Came out of a wrecked truck. I think the total job, paint, new intake, clutch and misc parts ended up at $1400 +/-
What ever I do, I will change bearings/ rings/ oil pump/ T chain/ get the heads checked. It there a BIG problem going to a Magnum with engine Balance issues ? I've got a 727 since the original engine was internally balanced. I will also need to keep all of my stock alt brackets/ motor mounts and possibly my mechanical fuel pump . Would like to use 91-92 Dakota exhaust manifolds but my current exhaust system is in perfect shape (maybe down the road)
Thanks for the input keep it coming At this point I'll be looking for a 318 magnum/ or 318 LA roller. (and yes this is like my last post/ but better input)