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Ok back on the carb topic... I've been doing a LOT of research over the past month (thanks for the links) prior to attempting working on this truck beyond some basic prep boredom. In my reading I came across something that peaked my curiosity as for increasing gas mileage as well as power. Is it a good idea for me to (and more to the point can I) replace the Holly 1945 with a Holley 4 barrel 4160 w/o having to swap out the manifold? .
It is not a good idea. There may be an adaptor or combination of adaptors that make this physically possible. However, at some point, the fuel/air mixture has to be shoved through the 1 bbl opening.
Mopar Performance has dabbled with the 390 cfm on the Offy 4 bbl manifold and has recommendations for it in Chapter 6 of their book (PN P4876827).
This is the AussieSpeed 4 bbl manifold that I am using on my /6. I think of it as a compromise between the Offy 4 bbl and the HyperPak manifold. In Austin, I think you'll miss the lack of manifold heat for about 3 minutes until things get warm when you light the fires. It is a bit more expensive than the Offy, but I thought it was worth it.
Point to consider: Any 4 bbl carb installed on the /6 with automatic is going to need an aftermarket kickdown linkage to get the transmission to shift properly. It may be possible to adapt a stock linkage to work, but is the cost of failure worth the effort?
