I have done what you propose minus the Anti-tramp bars, as PJB says will make it very stiff and harsh ride. Not really needed unless you are going racing or spinning rear wheels all the time at lights.
I have fitted 180lb top springs with Ball Bearing race between springs and stub axle, and lost the retraction plates, also Brake Reaction Bars, and AVO adjustable shocks all round, all from Mulfab. I got the geometry of the car measured at Protyre, and then Mulfab supplied predrilled neg camber plated for 0.75 neg camber. Speak to Peter Mulberry about what has to be done when fitting these.
When I fitted mine the new discs came with a kit to split the Girlings and fit a spacer plate so you can use with the vented discs. I would try this out first, as I find I can lock up the front and it is easy to over brake a Morgan.
Front springs are 1 inch shorter than standard lowering the car, but bear in mind, this puts the sump only 4 inches from the ground, so speed bumps need to be taken with car. I also fitted Stainless braided hoses all round which is worth doing while your at it. I also fitted the rear blocks to centre the rear axle in the arch (mainly cosmetic), it lowers the rear by about 3/4 inch but one benefit is that the axle clamp u bolts that you use from Mulfab are much stronger and also help to stop axle moving.
I am thinking about the Suplex springs but as the article in this months Miscellany from the chap who has fitted it to his +8, recommends that you try it first in a car with them, he obviously thinks it will not suit everyone depending on what you want. From my understanding it will give a better comfort ride, as the bumps will be absorbed easier.
So how do I find my car, it handles very well, steering is light, a bit go-kart feel, turn in is good, rear end very solid, braking much improved. Hardly any knodding donkey up front and I suspect if I had AVO's harder this would disappear altogether. I have my AVO's set at 1/3 roughly this gives reasonable comfort, go to 2/3 and it becomes pretty stiff, I have not had much chance to play around with it though.
Hope this helps.
