There is no vacuum line on a later TBI hot air tube. They are fully controlled by heat. Every time I have fooled with disconnecting the hot air from the air cleaner, the truck runs less predictably and gains nothing in power. This may be different with an air temp sensor but I wouldn't fool with it, the evaporation of fuel in the intake pulls a ton of heat out of the air.
There are always freaks toward the end of a production run, but generally, there are no roller provisions in a gen V (1995) BBC.
Without going into the engine you're limited. The best seat of the pants mod will be a good tune followed up by exhaust. DO NOT just go buy a set of used big block heads. The GenV is an oddball and you need to be careful bolting earlier heads on it, some of them will leak coolant, no matter if you use the "conversion" gasket or not. I wouldn't risk it, myself, but mine is a daily driver...
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