Porting small block 915 j-heads

Been studying my ‘Weslake’ J head ‘cutaways’ and they are very interesting indeed.
We all know about ‘Bob Mullen and Keith Black’s work’ on the famous 70 T/A heads for the “lunchbox 305” cube NASCAR engine, but was there work on the stock J heads being done at Weslake UK too?
Harry Weslake was ‘all for’ smallport heads...
This was more about a good ‘range’ of power for street driven cars!
When it comes to ‘high speed ovals’ then big is best...

I have been reading the wonderful Sox and Martin, most famous team in racing book.
They ran a F/stock Duster 1972 with a S/b 340 into the twelves. (11.70 best)
Maybe if they didn’t have 700hp hemi’s to play with, they would have done a lot more J head work lol...