I'm narrowing my thoughts on a MkIV Roadster and seeking ideas on drivetrain selections given some criteria and design intents:

Criteria
1. EFI engine desired.
2. New components desired, from engine to rear end.
3. Low integration effort if outside V8 configuration.
4. Budget limitations are a reality but for the purposes of discussion, eliminate really expensive stuff or unobtainium.

Design Intent:
Priority #1: Superior handling in a comfortable, though not accessory-laden, roadgoing setup.
Priority #1a: Horsepower is secondary to handling and #2 below.
Priority #1b: I will not strip the car in favor of performance. The most racing this car will see is an occasional autocross.
Priority #2: A level of performance that remains interesting even after honing driving skills.

I respect, but am unbounded by, Cobra history. Engine bay visual appeal is low priority. I am not tied to V8's. In fact, if the Cummins R2.8 crate engines were 200hp, I'd seriously consider. They're 160hp / 267lbft right now.

So, that's just one idea. Other ideas?