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@Scilly.Suffolk
First up: definitely worth restoring that beauty with period parts (but if you don't, it looks to be my size cough, cough). I too love the seat cluster, sometimes refered to as "fastback" and usually an indicator of a top quality build.
To return to your original question, although others are right that, in practice, the difference in tapers is immaterial no-one has mentioned the chain line.
There were two generations of Super Record bottom bracket: G1 had a hollow axle and used bolts to secure the cranks, it had a 112mm spindle. G2 had a solid axle and threaded ends using nuts to hold the cranks on; the spindle was available in lengths between 112mm and 115mm.
Assuming you have a 112mm spindle then you could use any of the C-Record era (late 80s to early 90s) cranks, as they normally used a 111mm spindle (and 135mm BCD).
However, I have just bought both English and Italian threaded 111mm C-Record era BB for £20 a piece, so there doesn't seem much point compromising: either bite the bullet and get Super/Nuovo Record cranks to match the BB or get a complete C-Record era set-up.
No disrespect to LFGSS, but I think Retrobike would be a better source of information and parts: as the name suggests it is aimed at riders of older bikes and naturally attracts older riders who have experience of the sort of problems you will face with a bike and parts of this age.