A friend of mine did something similar, in that he converted a b21 engined car to turbo and 2.4lh but kept the original engine (the car is pretty early and he wanted to keep the original engine in it).
There’s no reason to change cylinderheads over, just drill and tap the back of the block on the B21a for a crank position sensor, drill and tap the block for a knock sensor and drill and tap the the cylinderhead for an ecu temp sensor then put it in the car complete. The inlet manifold with the injectors etc will bolt on, as will the exhaust manifold.
It might be a tiny bit more sprightly than the B200f as a result of 100cc of capacity and slightly higher compression ratio, although there won’t be much in it.
Cheers
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