. . . I found out that the new 4 leaf springs will move the axle back, and will cause the bracket of the handbrake tree to foul or go into the fuel tank - Is this correct? . . .
Yes, however you can rectify that by using a pair of Mulfab centralisation blocks around the ‘wrong’ way to move the axle mounting pin forward. As a solution it will slightly lower the rear of the car but shorter, lowering front springs should re-balance the overall rake of the car.
The above worked for me on a 1972 car.
By observation, the suggested bump stops will stop the upper face of the diff nose hitting the transverse shock absorber mounting frame (for those with factory rear telescopic shock absorbers) they cannot stop the underside of the spring hitting the chassis.
