Opps forgot the other advantage of the C1J over the B18, when the Aston Db9 pulls up behind you in the petrol staion off the duel carrageway and says "bloody hell, I couldn't pull away from you, what you got in that thing? a 2 litre turbo engine? "
And you respond " nope just a 1.4 8valve pushrod lump"
As far as tyhe B18 conversion goes, yeah I'm sure it makes a damn sight better power more reliably than a C1J but if your going to all the hassle of dropping in a different engine to maximum power why limit yourself with an 8valve single OHC engine, why drop a 1.8 or 2.0 litre 16v and bolt a turbo, 300bhp easy.
You'd already be fitting a stand alone ecu so thats taken care of, you'd have to change the fuel pressure reg to suit the B18 so nothing extra there, the mounts are gunna take abit more work and the bottom end would need improvement to take a decent amount of boost, but when you can get 300bhp out a 1.8 16v for roughly 3 - 2.5grand why waste time on a B18?