Dave ,
A 6 cylinder Bristol engine weighs approx. 350lbs/159kgs .
A standard Rover V8 should be a idea option for a 406 , approx. same weight , it should fit behind the original front cross member and there should be enough width in the engine bay . A 5 speed manual box would suit.
The diff is a Salisbury which should take up to about 300bhp without a problem , and the standard disc brakes should stop it (maybe with better front calipers using larger pads).
The less modification the better , saves cost & time and in the future when people start returning these cars back to original condition it will make the job a lot easier.
I expect BCL changed to a coil spring /wishbone front suspension on the 407 to allow the 313 V8 engine and auto to fit low in the chassis. The front of the 6 cylinder engine sits over the top of the transverse spring/cross member .
Good Luck
Geoff
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