2A / 90 project

Hi all my m8's G reg 90's chassie is fooked, so he is planning on putting the TD engine, gearbox and power sterin from the 90 into his 2A 109 2.6, we know all about the points thing and tax exemption, but we don't know if the bulk head will need bashin a bit? and if he should go hole hog and add the coil spring setup of the 90 aswell? also will he have to do the front suspention anyway to fit the 90's power sterin?
Ta matrix

Wouldnt it be cheeper to just replace the 90's chassie ?

by the time you have swapped the engine-box-axles-suspension there wint be any pooiint left fer tax exemption