[Ant]

This engine runs a pro-systems 950 carb which is based on a 750cfm base plate.

That horsepower is a conservative figure when I was assisting with the dyno (NZ) we ran a restrictive air filter and exhaust, and oldish racing fuel. Engine has USA dyno sheets for 675bhp which used 2" spacer block under carb and better exhaust. Looking forward to re dyno with new ignition and premium unleaded, as I dont believe the engine is designed (10.3 comp) to run straight race fuel which is slower burning.
The only thing is with hood height etc I can only run a 3/4" carb spacer although that did make 16bhp difference on the dyno, so the extra high spacer might not make much more.

From your reply as this is a reasonably serious engine and to do the extra work of fitting crank trigger for stable timing to avoid detonation and possibly more power would be well worth it.

This would still bring me back to work out how best to run an advance curve with crank trigger.