Not many.
I do not know for a fact but my GUESS is 3 or 4..
882s,487s but there's bound to be others.
edit* 462624 was found on some 400s
I took a perfectly good set of rebuilt 882s off of my 400 to replace them with a pair of World Products Torquer heads that I had purpose-built for their new job.
I've got <$600 in the pair, I think.
Stainless valves (1.94)with bigger exhaust (1.60) , mild porting (casting flash and sharp edges -MILD -read cheap) surface milled to 72cc-ish. They have screw-in studs and 1.5 Comp Magnum roller tips that I already had.
AND they were drilled for the steam hole.
There is absolutely NO reason to seek out a pair of factory heads with steam holes unless you simply want to. 487s MAY be a better flowing head than a 882 but that ain't sayin much!
882s were such a fat and heavy boat anchor casting that you could port the pee-waddin out of them and FORCE IT to flow but this is well into a diminishing return.
There are many, many more - much, much better places to spend money on cylinder heads.
You can drill steam holes into any head and use it on a 400. Please don't let that mandate your choice(s) because the sky really is the limit and cylinder heads really are the primary limiting factor of how much power your engine will make. That is for sure the best place to spend money in a build.
Hope this helps!
FWIW : 083s and 113s were probably the best flowing gen1 sbc heads ever built. 083s are 64cc and 113 are 58cc though. Late model centerbolt covers with canted intake bolts.
Others may disagree but they'd be wrong.
*pro-tip:
Be sure to save an old head gasket to use for marking the holes. There is a tool made specifically for the steam hole drilling job.
