Yes emulsion tubes are available - 10s are no problem the others are a bit harder - Classic carbs (classiccarbs.co.uk) have had them, classic carbs here in oz have 10s (classiccarbs.com.au) as do Rocky SRL in Italy (ebay store)
I'd have a chat to Tony Byford before mucking around - he's very good
Yes a rolling road is the way to go
Not withstanding my comments about the idiosyncratic parts bin approach, if the car was otherwise running well, then the spitting back may well be something simple and amenable to tuning - particularly check the throttle linkages - if one carb is not opening at the same rate as the other two you can get spitting back
Julian
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