the 71-2 c-10 the a/c is on pass side.. but used the long a/c compressor
my 86 g body is on driverside.
my guess is all sbc with the type a/c compressor you have will be driverside.. with v belts..
maybe look at the early 90's truck with serp belt..(94 is on pass side)
image is of a 94 s-10 4.3v6
sbc 350 with 2 cyl chopped off.
just remember these serp. set ups need a reverse waterpump.. and if using a mecanical fan.. you'll need a reversed one also