Big cam = crap for turbo. ( no vac at idle, could be down to big cam )

Big carb = crap for turbo.

Vac advance, purely for driveability, economy etc. Not much need on a grass track engine.

To turbocharge it, you're going to need to make big changes. Fit a mild cam with very little or no overlap.
It will either need a new carb, or fit fuel injection.
It will need proper mapped ignition if using high CR, no IC and boost to get sensible and safe results.

For fuel injection, best bet is one of the carb style setups. Certainly it should be easiest and cheapest. Just slap it on top of the carb manifold.

You could still work with a dizzy and boost. But I would not recommend it with high compression ratio.
Especially when you could do the likes of Megajolt so cheaply