Brake Booster

From the photo, it seems as if the booster itself is fine but the long extended master cylinder reservoirs & caps do indeed get too close. FWIW, I usually recommend the adaption that uses the GM step-cylinder with crosswise fluid reservoirs. This booster is slightly bigger than stock but nothing gets close to the lid.
OK- I wouldn't expect washers to work because the booster actually bolts on with a triangular pattern. But an angled plate should do the trick. This will require you to dismount the whole booster, make a pattern, cut the angled spacer etc. Another option is to tilt the whole pedal mounting plate, and I don't know if this will cause problems with the clutch or brake pedal travels or not. You could try it, in the garage & see what happens. Again, washers won't work because they will expose a wide crack from the front trunk to the passenger compartment and you may get nasty drafts in as well as radiator heat if the top plate & seal aren't perfect. This also properly should be done with an angled plate.

It may be a step "Backwards", But have you thought of Remote Reservoirs!?

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Originally posted by MARLIN JACK:
It may be a step "Backwards", But have you thought of Remote Reservoirs!?

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Thanks both Jacks for the feedback. I am trying to find the simplest solution, and Jack's recommendation of a GM step-cylinder with crosswise fluid reservoirs may be something to look into. But I just need a fraction of an inch reduction. I am seriously thinking of filing down the top of the reservoir where the cap screws on, to see if the cap may screw on lower. But maybe due to threading tapers, not sure if this would really work or not. Maybe practice on a clorox bottle first or something. I am sure most are just facinated with this techincal issue.

Marlin, what is the remote Reservoir?

Early '71 Panteras, Mangustas etc had the front & rear brake system reservoirs remote-mounted against the inner fender & connected with short lengths of steel/rubber tubing. Later cars like yours & mine had the reservoirs rigidly attached. By fiddling with fittings etc, it may be possible to recreate this mounting. But none of the stock stuff will work since your entire master cylinder is aftermarket, which incidently is the main problem. Also note that not just any GM booster will work- they have a stock 4-bolt mounting which needs to be changed via cutting & welding (after total disassembly) to a 3-bolt to fit into a Pantera. If it were me, I think I'd contact the maker of your conversion & ask them for advice on how to get out of this mess. THey may have a fix already in place