Engine choice

[8man]

Ok, going with a S10 frame under the 48. I want to go with a V8, just cause.
I plan to convert the motor to a carb and distributor. I want to hear the carb sucking when I hit it, and the real reason is my wife likes the look better, and it's her truck. So I'm going to be buying parts with either motor.

My question is should I go with a 91 5.7 or a 97 5.7LS?

I understand there is a difference in how they mount to the frame, but this is the start of the build and I have to build motor mounts either way. I plan to use a 700R4 on either, realizing there will be a flex plate adaptor necessary for the LS and both will need the TV (I wish I knew what that stands for, I know it is the kickdown control, but why TV) cable so I will need the correct connector at the carb. Wiring will be necessary for either since there are no wires in or around the truck right now.

The question is the LS enough better to go that route or will I be wasting time looking for one?