Highest flowing sbm heads?

my old W5 car.
3220( guy who bought it was considerably lighter than me..lol)
tti headers
he upped cam to 276@50 ish 700 lift( mine was 273/280 with street friendly lobes) Dwayne I believe specced it, as he did my original one
modded victor w2
dominator 1100 gas.
around 14 to 1 gas ported slugs, I ran 13 to 1 no gas porting slugs previously
422 x block
super stock springs
non minitubbed( very old school car)
9.62@140……. Englishtown, it’s been high 9.60’s low 70’s 138+ several other places


As we both know Englishtown was a super fast track but at least you gave some info with your post.