I decided to go with the sniper. Tore it down this weekend and spent quite a bit of time sorting the old computer wires and sensors so I can remove them. Dad modified the throttle linkage for the GM TBI, so it looks like I will have to order new linkage for the Holley TBI. GM TBI originally used a cable and pulled from the bottom, where the carburetors (and it looks like the Holley sniper) pushed from the top.

1959 Chevy Apache
Follow in the DITY Gallery
"It IS my Father's TRUCK"
"It all does not have to be done at once." - Grandma