engine swap rules out classic status doesn't it?
assuming the majority of "chassis" remains the same than shouldn't need a IVA/SVA though (based on memory here though, it's been a while). seem to remember engine was worth 1 point, but you could find that points elsewhere in a built to get to you your 8 points.
No idea to be honest as I’ve never had anything old enough for classic. My knowledge of this kind of thing is from 15-20 years ago.
What’s the benefit of classic status?
My fire blade engined car was cheap tax and only £150 to insure at 19 years old back in 2004 ish