The way I see it is like this.......

There are a lot of options out there when you’re talking about $1675...... plus shipping both ways for the heads and manifold....... and that price doesn’t include reworking the heads any.
By the time you do the intake and shipping, rework the heads, plus a bunch of milling....... it’s easily a $2500 proposition.

For example........ if you sold the whole current top end, and added whatever $$$ you get from it to that $1675+ shipping....... you could buy a new set of heads and manifold.

Oh, and if the heads are getting milled a bunch...... that should be done before the intake gets matched to the heads.
Wilson might be able to perform that operation as well.

And of course....... to put some of that into perspective(confuse the issue?)........ those very heads(as “wrong” as they are)have already gone well into the nines.