uprated but not lowered suspension

[judgie]

building the 316 for road rallies and auto test and want a uprated spring set but dont want to lower it, 15/20mm would be ok but no lower.
whats out there? could i use the springs from a 6pot car on the front and touring springs on the rear?
just want to stiffen it up a bit
what about anti roll bars? can i fit ones from a bigger engined car if there a bigger diameter
going to go over all the bushes and replace with stock rubber ones, not a big fan of the poly bushes on road cars.
cheers for the help

[daimlerman]

When the cars were new,BMW offered standard,sport and M-tec suspension.

Sport stiffened the car without lowering it.
M-tec stiffened and lowered 15mm.

M-tec springs are still available from BMW,but are expensive.

I have never enquired about the sport springs availability.