even a CRDI engine would have 18:1 compression ratio, there is no fuel available commercially for sale that can satisfy those needs in a spark ignition engine. Unless you have reduced the CR with a spacer plate between the head and block. But still the cam phasing would be off - as a diesel cannot afford overlap. While you need it in a petrol one.
A CRDI would have the combustion chamber in the pistons, made for spreading the fire controlled in a diesel, not in a petrol one, in a petrol engine the squish is tuned so all mixture is pushed to the center for ignition and the flame spread then works the piston down.
In a diesel only air is pushed and the fuel is then piloted and injected to create the explosion. If you have cast a new head, ground a new cam from raw billet and cast new manifolds and a set of pistons, it sounds like a pile of burning cash.