Those Dart 225 CNC heads might be a bit much for a street car, especially a smallish 393. Those are more suited for all-out WOT power on a big-inch race motor. That same vendor gets the slightly smaller 210cc Dart Pro-1 CNC heads in once in a while.
Remember that the normal Dart heads 'as cast' use a regular SBF header flange. The CNC version uses the wide-pattern exhaust flange so as to leave room for large-tube headers.
Take a look at
this chart to compare a lot of popular SBF cylinder heads. Remember, most of the heads in this chart are un-ported. FWIW, the ported World Windsor Seniors I have on my 393 flow right up there with Eddy Victor Jrs!
Watch what block you use for your 393 or any stroker kit! Many kits cannot be used in the early Windsor blocks due to their 9.480 deck height. Later blocks had a 9.503 deck.
The 393 is fast going the way of the Dodo bird... It came about because of the cheap use of stock Windsor rods and stock cast 302 pistons. The stock-type cast 302 pistons are cheap, but
very heavy!
This 393W I put together for my '89 Crown Vic five years ago (before this pre-balanced kit was marketed) took a lot of expen$ive Mallory metal to get it to balance. Lots of better kits out there these days. If I were building my motor today, I'd go 408 or 418, and probably forged. Not all that big of a price difference, either!