Well after playing for a while with a supercharger manifold I made up for
my AMR500 supercharger and not being happy with the pulley arrangements
and having to start again I decided Id do a single SU manifold first.
I used some advice to try and improve the pulses using full radiused velo
stacks (solid) & lower roof on ends to make sure 1 & 4 inlets get same air.
If enough interest and prices are right for local casting I might consider
casting 6 or 8 of them. I wanted the old look to suit the era etc.

Here is the start using sch 40 steel for prototype which will be refined over
next few weeks for a quotation. Much time spent working out clearances for
su over exhaust system and also could be used for injection or LPG.
45 or 90 degree extention to inlet can be added for facing car/throttle towards
the front and improve torque slightly or for different layouts.

1st pic is of drawing for prototype
2nd with massive 2 inch SU
3rd with decent 1.75 inch SU
4th is just plenum

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I might have to spray the outside with some king of wax or resin to build up
the thickness for better strength and might also put some fins on it that
could easily be ground off it not wanted, but ideally its to suit the stock
old steel rocker covers and inlet flange will be 1.75 inch so peeps who want
the rarer 2 inch SU can bore it out to suit. To go larger again the adaptor
with 90 degree bend will be better for increasing volume as well.

So are you not charging anymore?

Yes I will Bart but have to make alloy pulleys instead (very expensive)
as the one I had made using 2 stock ones will be too heavy for crank snout.

Will have to update pic with more material at the top to allow for oval ports
but undecided atm as Im happy with the round ports drifty economy.
A long time member here has a turbo on stock round port with 100kws ATW.

I could probably get you one like mine for a couple of hundy(ish) Theres a crappy pic in my album.