For a GT6 you need a stepped manifold from TriumphTune. I have no idea
what they cost these days, probably $250-300 including linkage. The last
linkage set I got from them was so cheesy I returned it cobbled up my own.
Filter fit is a nuisance, because the filter plate for the rear carb wants
to interfere with the battery box. An air box is realy the way to go;
I like putting the a large filter on a plate of aluminum next to
the radiator, and then run a piece of 3" aeroduct back to the box.
Protect the filter with some wire mesh or a sold plate on standoffs.
You don't have a lot of room in that airbox; rule of thumb is that you
want a throat diameter's clearance around the intakes. That only leaves
room for very short stub stacks (check out TWM Induction) but
they make a lot of difference in performance (as much as 5-7HP).
Another excellent Weber book, recently printed, is Des Hammill's
"How to Power Tune Weber and Dell'Orto Carburetors" or some such.
I got it from www.rdent.com; has good details on strip/rebuild,
and also step-by-step instructions about getting them tuned,
even if you don't have a dyno.
It's to your advantage to find someone with a dyno, because they
usually have a large selection of jets and emulsion tubes, and
will do "free" part swaps. Buy 6 jets, tubes, or (horrors) aux
venturis just to try them out is an expensive proposition if you're
just trying to get one car done.
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