BUICK GNX 87 3.8L GAR TB0348

BUICK Monte Carlo/Regal 78-83 3.8L carbed GAR TB0348

Okay, so here's the question(s).... the GNX is blow through and the monte/regal is a draw through application, yet both use GAR/AIResearch TB0348. What's the difference? Can the earlier draw through be used in a blow through application?

Found a early draw through turbo. Trying to figure out what the options are with it. Any help would be great. Thanks!