It really depends on what you want and when you say 7 based model I assume that you mean Lotus7 caterham 7? so naturally with little tuning the 2.3 will have more power Not sure on the weight though I know someone in the UK with a 2.3 dura with 296 BHP pumping out of it IT IS MAD!!! he runs it in a westfield chassis on a personal scale I would go for the 2.0 brillant engines and a guess here but it is probally easier to find parts for them as a opposed to the 2.3?
Cheers RIch
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