I'll have a lot of interest in your project. I have a 1995 K1500, similar to your chassis and my Dad is building his sixth 67-72 vintage chevy pickup, which happens to be a '68.

Your stock TB and injectors will be fine if you can get the fuel pressure in the 22-25 psi range. You'll need to install a stiffer regulator spring that does not bottom out to achieve the desired pressure.

Did you install the stock narrow band oxygen sensor in one of the header collectors? It will be needed for tuning.

Did you get this Perf RPM intake http://www.summitracing.com/parts/ed...make/chevrolet and if so did you plumb coolant through the intake manifold plenum? It's my preference unless you're in a climate where it never gets below about 40°F.