Peter Baldwin is a guy who races Mini Miglia over 70 yrs old, so very much an 'old skool' tuner.

Carbs and distributor type guy...Not sure if he works on modern stuff? Maybe worth a call to him?

He's actually just been on Motors TV racing at Castle Combe.

The cheapest way of getting a power run is with a club/forum organised dyno day.

Ideally on a Dyno Dynamics rollers, so Pf approved