Block is not the same. It is a 14 bolt vs 20 bolt oil pan, among other changes.
The crank may or may not be the same. It is supposed to have rolled fillets on both mains and rods, but, it's a toss up whether it really will or not. On the flip side, an n/a v6 only came with rolled fillets on one instead of both, and performs the same as a .020 or so turned crank.
As far as the 200-4r goes... your later sfi backed unites used a different/special valve body; a larger reverse boost valve, second to third intermediate servo; and a specially designed governor assembly.
The 83 ttype was a BR code trans. To get the good stuff I listed above you want BQ, OZ, CZF, KZF or BRF transmission codes.
You can spend a bunch extra, but, why not start with a GOOD core instead of a low-performance oriented model.
I wouldnt put that in an 86 myself... maybe a 84-85 if you built it up strong, but not an intercooler car.