If it was a sucessful FACTORY blow through set up, they were choked from factory because they had to meet cold start emissions requirements for the Eurpean common market, Japan, or the US.
Same for blow throughs like Fords Mustang 2300 carb turbo (technically a failure), and ran a standard choke equiped 6520 Holley Weber feedback carb. So were the MMC/Mitsubishi/Colt draw through Solex 2-bbl carbed Mirage/Cordia and Tredia Jap Domestic market 1981-1983 1428 and 1595 cc engines. So were the 2 and 4-bbl carb variants of the F85 Olds and then the much later 1979-1982 "231" Buick 3800's and the Pontiac 301 Trans Am turbo's. "Sucess" was a relative term...any carb turbo, blow through or draw through from 1962 to 1983 was a lottery with respect to reliability, so much depended on ignition stability and what altitide, fuel and heat and stock comression ratio conditions the owner had to contend with. As soon as turbo's got Bosch injection, they were able to be tuned safely for heat and air density. To compare a 131hp carb 2.3 Turbo Mustang to 145 hp EEC4 EFI 2.3 used in 1983 Mustangs was like four generations of improvment, not just just the two calander years since the carb turbo combo was withdrawn.
Examples? For 1979- 1986 blow throughs, 45 DCOE's on Lotus Esprit turbo, the Weber DGAS 38 on the German Janspeed based Motorsport Capri 2.8 Turbo (170 hp), the same carb on the 1979 TVR 3000 (230 hp, or 90 hp up on the stock Ford of England Essex 60 degree 3 liter V6), all HIF SU's on British Leyland MG Metro Turbo's, and the masses of after market Pinto 1600 conversions done on Finland market Ford Sierra's (AKA Merkur XR4), same deal.
The Paxton Thunderbird/Gale Banks/BroadSpeed blow through carb design was to put a box around a stock multiple barrel carb, and treat it like it was just a 60% bigger engine.
For example, just an 8.5 psi Holset turbo took a stock 2994 cc 142 hp at 5500 rpm and 172 lb-ft at 3000 rpm engine to a stunning 230 hp and 273 lb-ft. 61.9% power, 58.7% up on torque.
Zoom up to large and see
http://www.flickr.com/photos/triggersca ... 674093521/
and
http://www.flickr.com/photos/triggersca ... 674093557/