Which engine should I choose?

[Modena]

Just on the engine power front, if you're not going to race (of some kind) then you really don't need massive power. Mine is 340kw out of the box and that's probably about 100kw more than I need - these are very light cars and are f*#$ing scary when you mash it.

Yes I know that might sound counter-productive in a Cobra, but there is actually a limit to useful power. If you can tick the noise and lumpy idle box, anything from a mild rebuild 5.0L, to an LSX, to a big block, all have enough grunt to generate a big smile. My point being simply that power alone should not drive your final engine decision. If you want to register it then your choices become fairly few.