I have only ever ran a stock one and it ran well.Keith, I have only run them at GTGs, and never a ported one, but they weight about what a 460/461 does, with more ccs. I hear they can be very strong ported, resulting if a VG Hp/Wt ratio. Also hear small case capacity for the ccs, and carbs need to be upgraded to get full benefit from porting.
However, they have a non existent dealer network and zero penetration into the pro market.