+3 question

It would be more like porting the motor to match the +3mm of stroke. Ports have to be lowered or risen to match the extended stroke of the crank. Anyone with experience porting and some math skills and able to work the calculations could do it... Oh and the right tools.
 
look up either wildcard racing. flotek performance. or ken oconner racing.. they are all very experience and very very good at what they do and will have that engine screaming in no time
 
My vote goes to Ken just for the solid support and time he spends with this community. I havent even been a member here for long, but Im already loyal to him. If I ever needed any porting type work done, Id send my engine to him for it.