B30 summary?
FWIW, there were 3 designations for the car/truck B30 - B30A, with twin Strombergs or twin SUs depending on market, or B30E (high compression)/ B30F (low compression for ULP), with D-Jet EFI (no K-Jet on B30s). The marine versions were the AQ170 series.
1974+ engines used an 8-bolt crank; pre-74 used a 6-bolt crank.
B30A had a C cam. B30E & F had K cams. Valves and springs are the same sizes as B20E, as are pistons and rods.
Oil pump, flywheel, and bellhousing are different to B20.
When they inevitably failed, the crappy fibre timing gears were often replaced with the Penta engine's steel timing gears, which never wear out or break. The gears are the same as the B20's; the B30 timing case fits on a B20 but not sure if it works the other way around (IIRC the B30 cover has one extra bolt hole).
Miracle Felt Oil Seals (so called, because it was a miracle if they sealed in any oil!) were used in the timing cover and crank rear main until 1974, at which time they got proper neoprene seals.
These engines are heavy muthas - in the region of 550 lb dry, without transmission.