One possible advantage is that Jensen interceptors used a 440 RB engine so you may have access to parts in stock within the UK still. But definitely time for freshening up the bottom end. I imagine even when it does start to pull after recovering from the endless bog, it's pretty anemic. Admittedly, I do like the idea of a stroker. One of the 4.35 inch bore by 3.9 inch crank affairs with reconditioned rods could probably make use of some off the shelf low compression cast pistons.