A better way is to run a GM TBI off of a 4.3 or 305. This way you get the same fuel distribution as a carb. without the flow sensitivity. If you are ok with making a wiring harness then suggest looking at megasquirt 2 - its runs a TBI no problem and a lot less $ than a holley box.

51 GMC 4.2 turbo
Can't solved today's problems using the same technology/thinking that created them