i've got a 350 sb which i was told by a reliable souce had a r/v towing cam and had been bored 30 over. i'm currently running a 600cfm holley( put on by the previous owner). i'm now being told that i would benefit greatly from a 750 cfm carb. no, i cannot afford F/Injection right now; so i'm needing some second opinions before purchasing this new carb. thanks and no i was not informed of the engine standards when i purchased the blazer.....it's a long story.