Here is a way to weld the tubes close together on the
intake manifold casting. Fabricate a small chunk of aluminum
to fit the space between the intake tubes.

Also shown is a complete 13B turbo intake system.
Integrating the intercooler with the intake manifold reduces
the pressure losses over a conventional system with remote mounted 
intercooler. That is a slide throttle that penetrates
the firewall with a simple push pull rod for the throttle control.

Paul Lamar
 
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