Like Dan I'd love to get my hands ahold of one of these trucks in the 1:1 world. There's a few mods that can be done with the TBI setup. It's nothing like can be done with done with a multi port fuel injection setup with a MAF but it'll yield a lot more power nonetheless.
Here's my truck that as of last Christmas got a 383 (that still utilizes TBI injection-but canned the TBI heads in favor of Vortec replacements) with a freshened up 4L60E, 2000 rpm stall converter and 3:90 gears.