Most early turbo setups were draw-through. Until real-time computer Fuel Injection, and real-time AFR mangement became standard equipment, manufacturer and home-brew turbo's typically were carbureted draw through with fuel and ignition schemes for boost conditions.
It wasn't for lack of power, but the MTBF wasn't manageable for Mfg. or aftermarket warranty. . For serious turbo build today, with the available fuel , ignition management and real-time AFR monitoring the Draw-Through turbo setup should be considered ...
'BOP'- (1980 Buick V6) Carbureted' Draw-Thru TBO-3 and Turbo specific Quadrajet setup adapted to inline Maverick 250 :