Mercruiser big block used 750 cfm webers and the small blocks used 600 cfm and the V- 6 used a 600 cfm weber as well. - 1996 was the last year Mercruiser used carbs for the 454. If I recall 1992 or 93 was the last year the 502 used carbs. The 502 MPI came out in 1993. Refering to Mercruiser here not Merc Racing as they had Holley s installed.
I need the Big block 750 cfm Weber carb with electric choke. Its currently the Edelbrock 1910 Marine carb.