I just spent a bit of time making all this work properly.
manifold is BRAND NEW 1500 Toledo, which has usually got tiny inlet for 150 carb and 1" inlet port sizes, like a peashooter.
This one has been returned for "normal" use and could be 1 x 45mm butterfly or a 175/HS6/HIF44 or some drillings for injection, and of course would go great with this head and the TR cam.
ahead again 10.35:1;-
All maybe revealed at Stoneleigh.
At least, unlike last year, there wasn't a Rover full of bits to steal & send to scrap at dead of night by the pikes a week or so before.