I'm not sure I envy you this task, but you have some oddities in there.
You list a B18 engine as a sub species. As far as I know they were alway B18A, B18B or B18B. in addition to the 120, PV and P1800 it was also used in the early 144. The B20 came in in 1969.
PV and Duett only got B18 A and D never the B18B
120 got B18 A, B and D, then B20 A and B from 69 on
1800 got only B18B then from 69 on B20 B, E and F, never the B18 D or A
140 got B18 A and B only never the B18D. From 69 on again B20 A and B with B20 E. as far as I know no UK 140 came with the B20F, it was E version only, but they did in the US, similarly the USA never got single carb B18 or B20. Before you know it this list is huge..........
1975 240 still got the B20 A or F in some markets
There are all sorts of weird sub species of the B19 B200, B230 engines missing, part of that refers only to whether or not there was a cat, but there are FD, FX GK, GT, G
You're missing the PRV, B27A E and F, B28A E and FB280 E and F
You're missing the D24TIC, D24T and D24
You're missing the B110 and B130 out of the Volvo 66
And once you get into 340/360 it gets really confusing because Volvo started to duplicate.
340/360 used B14, B19, B200, and D16
440/460 used B16 and B18
480 used B18 and B20
I wonder if it should be divided into a family tree? B4B, B14A B16 are one branch, all closely related.
You then get the B18, B20 and B30 which are all closely related.
That family morphed into the OHC redblocks B21, B19, B200, B23, B230
PRV family with B27, B28, B20.
6 Cyl Volkswagen diesel D24 family
Then the whiteblocks. even there there are sub species, the 850 used B5254/52/34/04/04 all 5 pot whiteblock. Similarly the 960 used B6304/6254/6244 but they're all a 6 pot whiteblock
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