There is only about 3/4" clearance between the face of the front carb and the inside of the canister.
Turbulance at the carb opening is an issue but it isn't a deal breaker as far as performance is concerned. I wanted to use something like the inner canister plate out of a twin carb MGB as it is almost perfect in its shape to ease the air flow, but alas the Bs use 1-1/2" SUs and of course the TR motor uses 1-3/4" units.
Intake stacks are pretty chancy things anyway. You can use them on race motors but they have to be "tuned" in length for a specific course, cam profile, porting, et al. Shorter or longer according to the most used rev band for the event. They look cool but they do very little or nothing for general road use.
Anyway the old TR engines have so much torque anyway that messing around with stacks is a losing proposition. I was just trying to strain out the birds, rocks and road kill on this engine.
