Long story short....
Hogged out stock intake hole, went clear through the wall and into the exhaust heat cavity behind.
![](http://sk.uploads.im/t/mDY7Z.jpg)
![](http://sl.uploads.im/t/HVdUj.jpg)
Made a steel sleeve to slip inside to make a solid wall again
![](http://sl.uploads.im/t/RFb6g.jpg)
Brazed the sleeve in place, drilled and tapped the 4 surrounding casting bumps, and had a machine shop mill the surfaces flat and to the exact same height
![](http://sm.uploads.im/t/McrZI.jpg)
Made skinny barrel nuts for the studs, the two bigger ones were Porsche 911 exhaust nuts, drilled and tapped to different thread size and reduced OD. They have a convenient 6-point Allen head at the end. The 4 smaller barrel nuts were brake line flare nuts, drilled and tapped and hex reduced to 10mm for extra clearance.
![](http://sm.uploads.im/t/Vx4P0.jpg)
Got a block of aluminum to make a carb adapter out of, for the Weber 38/38 clone
![](http://sj.uploads.im/t/8RcUf.jpg)
![](http://sj.uploads.im/t/XzNge.jpg)
![](http://sl.uploads.im/t/dJQCP.jpg)
bolted the sucka on with the recessed nuts
![](http://sm.uploads.im/t/RUhrb.jpg)
sandblasted the manifolds
![](http://sm.uploads.im/t/Sqiuk.jpg)
Painted them too
[img]http://sm.uploads.im/t/jmO6p.jpg[/img]
and replaced all studs with new. Currently waiting to find time to hang them on the car. Left a piece of aluminum sticking out of the adapter for now, in case I need to use it to fabricate a throttle cable bracket or something. Haven't thought that far yet, I'll burn that bridge when I get to it I guess.
Factory carb hole on the intake grew surface area by 46%, roughly the same amount the carb bore grew going from stock single barrel to two 38mm. The carb is a true 2bbl, butterflies open simultaneously.
I suspect this engine will make much more exhaust heat than needed to heat the intake, so I will be using the block-off LPG gasket between the exhaust and intake, and rely on conducted heat only.
Next step would be headers so this is not permanent.