Did a little bit of digging on the Renix 405 system, it appears to be spark only and the version without the rev limiter.
https://www.classicswede.co.uk/storepage4035646.aspx
Also, the B200E, uses a stepped flywheel with 44 pattern = 20 holes / 2 missing / 20 holes / 2 missing, which, as we all know, is different to LH 2.4.
There's a lot of info on
http://www.volvo300mania.com - a real gold mine of green books and stuff there for the 300s.
EFI diagram on page 10, Renix diagram on page 28.
http://www.volvo300mania.com/technical/v3m_technical_wiring_diagrams.pdf